Mason Disick became a big brother last weekend when his mom, Kourtney Kardashian, gave birth to Penelope Scotland Disick -- but even with a new baby in the family, Mason still has everyone's attention.

On Saturday, the reality-TV family's most adorable member frolicked on the beach with his 16-year-old aunt, Kendall Jenner. The teenage model sported a turquoise bikini as she and Mason played along the Malibu shoreline, throwing around a football.

The pair looked like they had a blast and were also joined by Kendall's 14-year-old sister, Kylie, and friends.

After getting their fill of the waves, the group packed up and later shared a post-beach treat with their Twitter followers. The sisters posted a short video of Kendall driving home from the beach, as they sang along to Kanye West's hit song "Mercy."

PHOTO:
kendall jenner bikini mason disick beach
More stars on the beach:

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  • Hayden Panettiere

  • Ciara

  • Maria Menounos

  • Gwen Stefani

  • Lea Michele

  • Angela Simmons

  • Janice Dickinson

  • Anne Hathaway

  • Angela Simmons

  • Ciara

  • Shemar Moore

  • Rosie Huntington-Whiteley

  • Naomi Campbell

  • James Marsden

  • Rachel Bilson & Hayden Christensen

  • Nicolette Sheridan

  • Balthazar Getty

  • Josh Radnor

  • George Clooney

  • Minnie Driver

  • Gwen Stefani

  • Emma Thompson

  • Sharon Stone & Boyfriend

  • Bruce Jenner

  • Eric Dane

  • Sharon Stone

  • Kelly Rowland

  • Angel McCord

  • Kelly Bensimon

  • Hayden Panettiere

  • Naomi Watts

  • Kate Hudson

  • Courteney Cox

  • Ashlee Simpson

  • Stephanie Seymour

  • Julianne Hough

  • Miley Cyrus

  • Gwen Stefani

  • Lindsay Lohan

  • Rita Rusic

  • Denise Richards

  • Michelle Rodriguez

  • Katie Holmes

  • Aimee Teegarden

  • Tori Spelling

  • Paris Hilton

  • Christina Milian

  • Kelly Rowland

  • Julianne Hough

  • Tori Spelling

  • Stacy Keibler

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