56 celebrities you probably forgot guest-starred on 'How I Met Your Mother'

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jennifer lopez joe manganiello britney spears
Jennifer Lopez, Joe Manganiello, and Britney Spears guest-starred on "How I Met Your Mother." David Crotty/Patrick McMullan via Getty Images; David Crotty/Patrick McMullan via Getty Images; Steve Granitz/WireImage

Joe Manganiello had a recurring role as Brad, one of Marshall's friends from law school.

joe manganiello on how i met your mother
Joe Manganiello starred as Alcide Herveaux on "True Blood." CBS

Brad and Marshall became closer after their girlfriends broke up with them. On season two, they went to brunch together and Marshall was teased by Ted and Robin for his newfound bromance.

In 2007, model Heidi Klum made an appearance as herself.

heidi klum on how i met your mother
Heidi Klum won a Primetime Emmy in 2013. CBS

Klum met Barney at a Victoria's Secret after-party, and gave him some love life advice.

Enrique Iglesias serenaded Robin as Gael, a man that she met in Argentina.

enrique iglesias how i met your mother
Enrique Iglesias is an award-winning singer. CBS

All the women at MacLaren's were drooling over him.

"Pretty Little Liars" star Lucy Hale played Robin's younger sister, Katie.

lucy hale on how i met your mother
Lucy Hale starred as Aria Montgomery on "Pretty Little Liars." CBS

She first appeared on season two and returned for Robin's wedding during season nine.

Fellow "PLL" star Ashley Benson also had a role on "HIMYM."

ashley benson on how i met your mother
Ashley Benson starred as Hanna Marin on "Pretty Little Liars." CBS

She played 20-year-old Carly, who briefly dated Ted — and turned out to be Barney's half-sister.

Wayne Brady appeared throughout the series as Barney's half-brother, James.

wayne brady ho wi met your mother
Wayne Brady is a comedian. CBS

James identified as gay and went on to get married — a milestone that initially disappointed Barney.

Lin-Manuel Miranda rapped his way through his role on season nine.

lin manuel miranda on how i met your mother
Lin-Manuel Miranda is the creator of Broadway's hit musical "Hamilton." CBS

His character, Gus, encountered Marshall and baby Marvin while on a bus to Farhampton.

Jennifer Morrison had a recurring role as Zoey, Ted's enemy-turned-girlfriend.

jennifer morrison on how i met your mother
Jennifer Morrison starred as Emma Swan on "Once Upon a Time." CBS

She was an activist who often protested around New York City.

Kyle MacLachlan played George Van Smoot - aka The Captain.

Kyle MacLachlan how i met your mother 2.JPG
Kyle MacLachlan is best known for his role as Dale Cooper on "Twin Peaks." CBS

The Captain was married to Zoe before she left him for Ted.

In 2011, Katy Perry played Zoey's friendly, yet "gullible" cousin.

katy perry on how i met your mother
Katy Perry's real name is Katheryn Elizabeth Hudson. CBS

Ted and his friends couldn't remember the name of Perry's character, so they referred to her as "Honey" when they later told the story of how they met.

On season three, John Cho's character successfully convinced Marshall to join his company.

john cho on how i met your mother
Fans might recognize John Cho for his role as Sulu in "Star Trek." CBS

Shortly after joining, Marshall resigned because he didn't agree with the company's environmental policies.

"Harold and Kumar" star Kal Penn played good guy Kevin.

kal penn how i met your mother
Kal Penn is most known for the "Harold and Kumar" franchise. CBS

Kevin was Robin's therapist-turned-boyfriend. The two broke up over Robin's desire to not have kids.

Ted got drunk with a girl named Amy - played by Mandy Moore - and woke up the next morning with a butterfly tattoo on his back.

mandy moore on how i met your mother
Mandy Moore stars as Rebecca Pearson on "This Is Us." NBC

Throughout the episode, Moore's character mocked and made fun of Barney.

Carrie Underwood guest-starred as Tiffany, who strung Ted along.

carrie underwood on how i met your mother
Carrie Underwood got her big break on "American Idol." CBS

Tiffany was in a complicated relationship with another guy, but asked Ted to "be patient" because she didn't want to lose him.

"Dawson's Creek" star James Van Der Beek played Robin's first boyfriend Simon, from her days as a teen pop sensation in Canada.

james van der beek on how i met your mother
James Van Der Beek starred as Dawson Leery on "Dawson's Creek." CBS

Simon and Robin met on the set of her music video for "Sandcastles in the Sand."

Jennifer Lopez guest-starred as an author named Anita on season five.

jennifer lopez how i met your mother
Jennifer Lopez landed her first role in the '80s. CBS

She made an appearance on "Come On, Get Up New York!" and helped Robin work through her relationship issues with Barney.

David Burtka, Neil Patrick Harris' real-life husband, had a recurring role as Scooter.

david burtka how i met your mother
David Burtka also appeared on "A Series of Unfortunate Events." CBS

He was Lily's old high school boyfriend and repeatedly tried to win her back on several episodes.

"Gotham" actress Morena Baccarin played Chloe, a barista who had a crush on Marshall.

morena baccarin on how i met your mother
Morena Baccarin starred as Vanessa in the "Deadpool" movies. CBS

Barney and Ted warned Marshall that Chloe had "crazy eyes" and said he should be cautious.

Smulders' real-life husband Taran Killam also appeared on a few episodes.

taran killiam on how i met your mother
Taran Killam was a cast member on "Saturday Night Live" for several years. CBS

His character, Blauman, was part of the legal department at Goliath National Bank, where Barney and Marshall also worked.

Britney Spears guest-starred as Abby, a receptionist at the dermatologist office where Ted's future fiancée worked.

britney spears on how i met your mother
Britney Spears also guest-starred on "Sabrina, the Teenage Witch." CBS

She ditched her glasses and dressed up in an attempt for Ted to notice her.

John Lithgow played Barney's father, Jerome Whittaker.

john lithgow on how i met your mother
John Lithgow has won several Emmys in the past. CBS

They were estranged for 30 years, but reconnected.

Katie Holmes guest-starred as Naomi, a girl who Ted met at a Halloween party.

katie holmes on how i met your mother
Katie Holmes starred as Joey Potter on "Dawson's Creek." CBS

When Ted finally reconnected with her years later, he was disappointed to find out that they didn't have chemistry.

"Crazy Ex-Girlfriend" star Rachel Bloom had a cameo as a drunk passenger on a train on season seven.

rachel bloom on how i met your mother
Rachel Bloom is a Golden Globe-winning actress. CBS

She threw a drink in Ted's face when he approached her.

"Growing Pains" actor Alan Thicke guest-starred as another character from Robin's pop star past.

alan thicke on how i met your mother
Alan Thicke guest-starred on "Murder, She Wrote" in 1993. CBS

He played her father in a music video, and they worked together on a show called "Space Teens."

Nicole Scherzinger played Jessica Glitter, Robin's former BFF.

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Scherzinger was the lead singer of the Pussycat Dolls. CBS

Glitter and Robin grew apart after she had a baby, but the two reunited years later thanks to Marshall and Lily.

"Orange Is the New Black's" Laura Prepon played Ted's snobby college girlfriend named Karen.

laura prepon on how i met your mother
Laura Prepon rose to fame for her role as Donna on "That '70s Show." CBS

Lily and Marshall hated Karen's pretentious attitude.

Bob Barker appeared as himself, and was the first of many game show hosts to appear on the show.

bob barker how i met your mother
Bob Barker, host of "The Price Is Right." CBS

Barney believed Barker to be his father, and went on "The Price Is Right" to confront him.

"Jeopardy's" Alex Trebek guest-starred as a game show host, naturally.

alex trebek on how i met your mother
Alex Trebek is an Emmy-winner. CBS

He appeared on a show called "Million Dollar Heads or Tails," which Robin auditioned to be the "currency rotation specialist" for.

Regis Philbin joined the gang on their hunt for the perfect burger.

regis philbin how i met your mother
Regis Philbin was the original host of "Regis and Kathy Lee" and "Who Wants to Be a Millionaire." CBS

He left his hosting gig on "Million Dollar Heads or Tails," to test the product.

Rachel Bilson had a recurring role as Cindy, the roommate of Ted's future wife Tracy.

rachel bilson on how i met your mother
Rachel Bilson starred as Summer Roberts on "The O.C." CBS

Cindy and Ted also dated, but it didn't last long.

"Lost's" Jorge Garcia played Steve "The Blitz" Henry on a Thanksgiving-themed episode.

jorge garcia on how i met your mother
Jorge Garcia starred as Hugo "Hurley" Reyes on "Lost." CBS

He met Ted and Marshall at Wesleyan University.

Abigail Spencer's character was simply referred to as "Blahblah" - because Ted couldn't remember her name.

abigail spencer on how i met your mother
Abigail Spencer has appeared on shows like "True Detective" and "Grey's Anatomy." CBS

She and Ted briefly dated after meeting online.

Maury Povich played himself in the episode "Subway Wars."

maury povich how i met your mother
Maury Povich is the long-time host of "Maury." CBS

One of Marshall's coworkers confused Povich for Woody Allen.

Tim Gunn had a fitting role as Barney's personal tailor.

tim gunn on how i met your mother
Tim Gunn is known for being a producer and mentor on "Project Runway." CBS

He showed up on short notice to help Barney with suit-related emergencies.

Jane Seymour played Professor Lewis, one of Marshall's teachers at law school.

jane seymour on how i met your mother
Jane Seymour has won two Golden Globe awards. CBS

She went through a divorce, and Marshall was convinced that was the reason why she was a harsh grader.

Bryan Cranston guest-starred as Ted's demeaning boss, Hammond Druthers.

bryan cranston how i met your mother
Bryan Cranston won a Golden Globe for his role as Walter White on "Breaking Bad." CBS

Lily tried to teach Hammond a lesson by stealing one of his prized possessions.

Cranston isn't the only "Breaking Bad" cast member who showed up on "HIMYM." Bob Odenkirk also appeared on a few episodes.

bob odenkirk on how i met your mother
Bob Odenkirk stars on AMC's "Better Call Saul." CBS

His rough disposition and the way he treated his coworkers (including Marshall) earned him the nickname "Artillery Arthur."

"Glee" actress Jayma Mays guest-starred as a coat closet attendant at a club.

jayma mays on how i met your mother
Jayma Mays played Emma Pillsbury on "Glee." CBS

Ted bonded with her, but forgot to exchange phone numbers.

In 2013, "Full House's" Dave Coulier guest-starred as himself.

dave coulier on how i met your mother
Dave Coulier played Joey Gladstone on "Full House." CBS

He appeared on a documentary about Robin's former singing career.

Danica McKellar played Trudy on one of the series most puzzling episodes - "The Pineapple Incident."

danica mckellar on how i met your mother
Danica McKellar starred as Winnie Cooper on the '80s and '90s show "The Wonder Years." CBS

Ted spent the entire episode trying to piece together details from a night when he got drunk and couldn't remember anything.

Busy Philipps later appeared as Trudy's friend, Rachel.

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Philipps starred on "Freaks and Geeks" and "Dawson's Creek." CBS

They were sorority sisters who Ted may or may not have had a threesome with.

Billy Zabka made several appearances as himself throughout the series.

Billy Zabka how i met your mother.JPG
Billy Zabka starred as the villain in "The Karate Kid" franchise. CBS

While people who watch "The Karate Kid" love Ralph Macchio's character, Barney has a special place in his heart for Zabka.

Ralph Macchio showed up at Barney's bachelor party as himself.

ralph macchio how i met your mother
Ralph Macchio got his start as the hero of "The Karate Kid." CBS

This was part of an elaborate prank executed by Robin.

Judy Greer played Royce, one of the many women Ted dated.

judy greer how i met your mother.JPG
Judy Greer has been in several movies, including "13 Going on 30" and "The Descendants." CBS

Royce was a fan of "The Wedding Bride," which Ted did not care for.

Kendra Wilkinson starred as herself on the cover of a tabloid magazine.

kenda wilkinson how i met your mother 2
Kendra Wilkinson is best known for being a Playboy bunny. CBs

Wilkinson, and several other reality stars, tried to talk Marshall through his struggles to go "number two."

Spencer Pratt and Heidi Montag - aka Speidi - taunted Marshall for his bathroom insecurities.

spencer pratt and heidi montag
Spencer Pratt and Heidi Montag are realty stars. CBS

Luckily for Marshall, the problem didn't last too long.

Kim Kardashian managed to help Marshall get over his fear of using a public restroom.

Kim Kardashian How I met Your Mother
Kim Kardashian is a reality star and beauty mogul. CBS

Marshall admitted to not knowing why Kardashian was famous — a question many asked at the time.

Sarah Chalke starred as Stella, the woman who would break Ted's heart and leave him at the altar.

sarah chalke how i met your mother
Sarah Chalke became a household name after starring on "Scrubs." CBS

She left Ted to be with her ex-husband and the father of her daughter, Lucy.

Ted claimed that he gave Weird Al the idea for "Like a Surgeon."

weird all how i met your mother
Weird Al is a musician known for his clever parodies. CBS

It was later confirmed in a flashback starring the singer.

Will Forte made several appearances as Randy Wharmpess, a colleague of Barney and Marshall's.

will forte how i met your mother
Will Forte has appeared on "SNL" and "Last Man On Earth." CBS

Randy eventually quit his job to pursue his passion for brewing beers.

Keegan-Michael Key and Casey Wilson guest-starred as Calvin and Krirsten, a couple that Robin and Barney encountered while on a dinner date.

keegan michael key and casey wilson how i met your mother
The actors appeared on season eight. CBS

The two pairs became arch enemies, and Robin and Barney hatched a plan to try and break them up. It backfired and the couple ended up getting engaged.

Ted asked a student named Penelope, played by "The Gifted" star Amy Acker, to help him do a rain dance.

amy acker how i met your mother
You might recognize Amy Acker from "Alias" and "Angel." CBS

Penelope was studying Native American culture. Ted hoped that if they made it rain, it would prevent Robin from going on a trip with her coanchor, Sandy Rivers.

Actor Martin Short played a senior partner named Garrison Cootes at an environmental law firm called Honeywell and Cootes.

martin short how i met your mother
Martin Short starred as Jack Frost in "The Santa Clause 3: The Escape Clause." CBS

Cootes offered Marshall a position at the firm, but the latter was worried that he wouldn't pass the company's background check because of an old video of himself streaking.

Robbie Amell played Robin's dog-like boyfriend Nate Scooberman, who preferred the nickname Scooby.

robbie amell how i met your mother
Robbie Amell played Ronnie Raymond on "The Flash." CBS

Robin met him at a park, shortly after Ted denied her request to get a dog. Their relationship didn't last too long.

Tracey Ullman appeared as Robin's mother, Genevieve Scherbatsky, on the final season.

tracey ullman how i met your mother
Tracey Ullman won a Golden Globe in 1988. CBS

Robin was surprised that her mom made it to her wedding to Barney, considering that she's scared of flying.

"The Vampire Diaries" star Candice King looked unrecognizable with red hair on season two.

how i met your mother candice king
Candice King on season two of "How I Met Your Mother." CBS

She played Lily's cousin named Amy, who was in beauty school. She gave Marshall frosted tips shortly before his wedding to Lily.

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