Sofia Richie Celebrates 21st B-Day With Scott Disick, Kylie Jenner

Sofia Richie knows how to party! The model jetted off to a whirlwind 21st birthday celebration in Las Vegas on Saturday, August 24 — and documented the hours of fun on Instagram.

Richie kicked off the party with a glam session that saw her “getting ready” with epic dance moves as she got her hair and makeup done. Decked out in all pink, the California native headed out to Sin City on a private plane with a handful of close girlfriends.

The first leg of the day began with a poolside party at Encore Beach Club, which was deejayed by Alesso and included life-size cardboard cutouts of Richie, as well as pillows that featured photos of her beloved dog Hershela.

Richie showed off her toned body in an orange bikini for the bash, and was accompanied by her boyfriend, Scott Disick, who wore a button-up shirt and showed off some low-key PDA with his…