North West and Penelope Disick pose for Jojo Siwa's 16th birthday

Cousins' night out!

North West, 5, and Penelope Disick, 6, hit the red carpet for "Dance Moms" alum Jojo Siwa's 16th birthday party the W Hotel in Hollywood, C.A.

The adorable girls were happier than ever flashing big smiles for the camera posing with the YouTube star. North sported hot pink biker shorts with a green sequin jersey and a giant bow, while Penelope wore a rainbow sequin track suit. The BFFs both completed their major looks with sparkling combat boots.

"Fuller House" star Jodie Sweeting also attended alongside her daughters, Beatrix and Zoie.

Jojo has been a longtime favorite celebrity of North West. Earlier last week, the YouTube star took on the role of babysitter for North in her latest video. The two wore matching rainbow ponytails, made slime and played hide-and-go seek.

North is the oldest daughter of Kim Kardashian and Kanye West, and Penelope is the second oldest of Kourtney Kardashian and Scott Disick's three children together.

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