Cousins' Night Out! North West and Penelope Disick Hit the Red Carpet for JoJo Siwa's Sweet 16

Kim Kardashian West‘s daughter North West and Kourtney Kardashian‘s daughter Penelope Disick made a splash on the red carpet Tuesday, as they celebrated JoJo Siwa‘s sweet 16.

The cousins and BFFs — North, 5, and Penelope, 6½ — posed alongside Siwa and a few of their friends (including 6-year-old Ryan Romulus, the daughter of Kanye West‘s publicist Tracy Nguyen Romulus) at the birthday party, held at the W Hollywood in Los Angeles.

They looked happy could be, smiling wide for photographers. North wore a sparkling green top, pink shorts, and silver shoes — a colorful ensemble she highlighted with a rainbow fannypack and oversized hair bow. Penelope, meanwhile, wore a rainbow sequin tracksuit with a black T-shirt and rainbow boots.

At one point, the girls all flashed a big peace sign at the camera.

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RELATED: Kim Kardashian Lets JoJo Siwa, 15, ‘Pretend’ Babysit Daughter North: ‘You Did Make a Big Mess!’

Siwa, a Dance Moms alum and YouTuber, has long been a favorite celeb of North’s.

Late last month, Siwa got to “pretend” babysit North, having a play date all day with Kim and Kanye’s oldest child.

Their afternoon together, which Kim helped set up, was filmed and posted on Siwa’s YouTube channel on March 31. The nearly 7-minute video begins with Kim, 38, dropping off her daughter before North and Siwa — in matching rainbow side ponytails — take a tour Siwa’s very colorful house.

North appeared to have had a ball. At one point, she showed off her splits during dance time to Siwa’s single “Bop” and climbed all over the singer’s infamous custom BMW (dubbed the Dreamer Mobile).

So what was North’s favorite part of the whole day? “Making a big mess,” she told her famous mom.

“Oh my God, you did make a big mess! Hey, you have to go clean up your mess,” Kim told North, who enthusiastically agreed that it was the best day of her life.

To top it all off, North was gifted with tickets to Siwa’s D.R.E.A.M. The Tour concert — an event for which the singer encouraged North to bring Penelope.

“I had so much fun pretend babysitting Kim Kardashian West and Kanye West‘s little girl North West!” Siwa later wrote on YouTube.

“I had so much fun getting to film with North and @kimkardashian. Seriously North is SO adorable and awesome, and Kim is one of the SWEETEST people ever!” the teen sensation also shared on Instagram.

Kim was equally happy with how the day went. “My baby girl North had her dream of life come true! She got to spend the day with @itsjojosiwa #speechless #bff #Only5Once,” Kardashian West tweeted Sunday along with a selfie of North and her idol.

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