Keep up with Kris Jenner's 10 grandchildren - Mason, Penelope, North, Reign, Saint, Chicago, Stormi, True, Dream

With the news of the birth of Kim Kardashian and Kanye West fourth baby -- a boy! -- Kris Jenner is officially a grandmother of 10.

Kris is the mother of six children from two marriages -- Robert G. Kardashian and Bruce Jenner (now Caitlyn). Kris and her late ex-husband, Robert, had Kourtney, Kim, Khloe and Rob Kardashian. Caitlyn shares Kendall and Kylie Jenner with Kris.

Kourtney surprised Kris on Friday's episode of "The Ellen DeGeneres Show," where she came out with her own kids and Kim's because Kim was at the hospital with her surrogate, who'd gone into labor. The segment went viral thanks to Kourtney's youngest son's hilarious and candid moments.

Ahead, we're breaking down everything you need to know about the Kardashian-Jenner matriarch's 10 grandkids. Can you keep up?

Mason Dash Disick, 9

Mason is the oldest grandchild of Kourtney Kardashian and Scott Disick. He was born on December, 14, 2009. Kourtney famously pulled out her own son during labor. Relive the moment here.

Penelope Scotland Disick, 6

Penelope is Kourtney and Scot's second old child. She was born on July, 8, 2012. Kourtney named her lifestyle brand after Penelope's nickname, Poosh.

North West, 5

North is the oldest of Kim Kardashian and Kanye West's four children. She was born on June 15, 2013. At just 5-years-old, she's already graced the cover of WWD. "Whether she knows it or not, is at the forefront of a generation that is highly connected," the outlet wrote.

Reign Aston Disick, 4

Saint is youngest child of Kourtney and Scott. He was born on December 14, 2014. Yup! He and his older brother, Mason, share a birthday!

Saint West, 3

Saint West is Kim and Kanye's first boy. He was born on December 5, 2016 via surrogacy after doctors told Kim she can no longer carry children due to a high-risk condition called placenta accreta.

Dream Kardashian, 3

Dream is Rob Kardashian (Kris' youngest son) first child who he shares with Blac Chyna. She was born on November 10, 2016. The couple is separated after going through a slew of public differences.

Chicago West, 1

Chicago is Kim and Kanye's youngest girl. She was born on January 15th, 2018. She was named after the city her dad grew up in and is usually referred to as 'Chi.'

True Thompson, 1

True is Khloe Kardashian's first born, who she shared with her ex-boyfriend and NBA star Tristan Thompson. she was born in April 2019.

___ West

Kim Kardashian and announced the birth of fourth child on May 6th. We are still awaiting the name! Kim took to Twitter to share "He's here and he's perfect!" "He’s also Chicago’s twin lol I’m sure he will change a lot but now he looks just like her," she added.