Kim Kardashian  joined her younger sisters, Kendall Jenner and birthday girl Kylie Jenner, at the Teen Choice Awards on Sunday. Kylie, who turned 17 on Sunday, wore a similar style to Kim's, with both of them sporting crop tops and printed skirts. Meanwhile, choice hottie nominee  Kendall looked white hot in pants and a draped top, posing alongside her sisters on the red carpet. Earlier in the day, Kim took to Instagram  to post several throwback pictures of Kylie for her birthday, and Kylie shared a photo  of herself and her friends wearing hats with her face on them. They have another reason to celebrate, too — their show, Keeping Up With the Kardashians, won choice reality show. Take a look at the best pictures of the sisters, and then check out all the celebrities at the Teen Choice Awards !