04/22/2011 02:26 pm ET | Updated Jun 22, 2011

Kendall & Kylie Jenner At 'Prom' Premiere (PHOTOS)

The young model half-sisters of the Kardashians, Kylie and Kendall Jenner, were leggy in blue at the premiere of Disney's 'Prom' Thursday night in LA.

Earlier in the day, Kendall tweeted anniversary wishes to her parents, Kris and Bruce Jenner.

"happy 20th anniversary mom and dad!!!!!!!!!!!!!! (@KeepinUpWKris) I love you guys sooo much! BESTEST parents in the worlllldddddddddd," she wrote.


And here they are with Kourtney and Kim at the Nickelodeon 2011 Kids' Choice Awards a couple weeks ago: