Keith Richards, Sturgill Simpson celebrate Willie Nelson at 90th birthday concert

No one throws a party quite like Willie Nelson.

The world-class singer-songwriter and well-traveled showman hosted a 90th birthday party last weekend with a guestlist spanning rock 'n' roll icons, country crooners, Americana pickers and hip-hop hitmakers. Hosted at the Hollywood Bowl in Los Angeles, one night wasn't enough for Nelson's 90th — the concert spanned two nights of all-star singalongs and surprise jams in Southern California.

Guests included George Strait, Snoop Dogg, Norah Jones, Miranda Lambert, Billy Strings, Neil Young, The Chicks, Chris Stapleton and The Lumineers, among many, many others.

Fan-shot concert videos from the Hollywood Bowl took hold of social media this weekend. Let's dig into some moments making waves from Los Angeles to Music City.

More: George Strait, Snoop Dogg and other highs from night 1 of Willie Nelson 90th birthday bash

Kris Kristofferson comes out of retirement

A few years of retirement couldn't keep Kris Kristofferson from celebrating his Highwaymen bandmate. Kristofferson, who quietly bowed out of touring in 2020, returned to the stage last weekend at the Hollywood Bowl to sing a pair of duets from his storied songwriting catalog: 1971 single "Loving Her Was Easier (Than Anything I'll Ever Do Again)" with Roseanne Cash and “Help Me Make it Through the Night," a collaboration with Jones. Released in 1970, Nelson covered "... Make it Through The Night" in 1980.

"Oh, it's beautiful," one fan said on video as Kristofferson and Cash sang in front of a backing band that featured Grand Ole Opry member Jamey Johnson, Heartbreakers member Benmont Tench and longtime Nelson sideman Mickey Raphael.

Sturgill Simpson sings a classic

In his first on-stage appearance since a vocal injury sidelined Simpson in late 2021, the singer paid tribute Saturday to Nelson's outsider approach to country music-making. He sang 1970s Nelson cut "I'd Have To Be Crazy," which Simpson recorded for the closing number on his decade-old solo debut "High Top Mountain."

“I’m going to take a minute to say something that I’ve never had the courage to say to his face, and that is there’s only one reason I ever went to Nashville to make country records: ... ‘cause I grew up listening to country records made by Willie Nelson," Simpson said. "I wanted to make country records that were outside the box of what most people think a country record can be."

More: 'His heart is genuine': 11 quotes about Willie Nelson that capture his legacy

Keith Richards surprises the audience

During Nelson's set Sunday night, famed Rolling Stones guitarist Keith Richards emerged from backstage to performed a pair of songs with the 90-year-old troubadour: "We Had It All"," a song cut for Waylon Jennings' 1973 album "Honky Tonk Heroes" that Nelson and Richards previously performed together, and the Billy Joe Shaver-penned "Live Forever," an on-the-nose nod to each's enduring legacy.

This article originally appeared on Nashville Tennessean: Keith Richards, Sturgill Simpson celebrate Willie Nelson's 90th birthday