Kendall and Kylie Jenner popped up in Sin City for the Billboard Music Awards on Sunday, striking a pose together ahead of the show. Kylie took to Instagram [1] to share a picture of the sisters' night out, with both stars sporting sky-high heels. Kendall and Kylie's award-show appearance comes just days after Kendall went to Cannes [2] for her first time, and the week is only going to get more exciting as they prepare to watch their sister, Kim Kardashian [3], marry Kanye West [4] next weekend. In the meantime, take a look at Kendall and Kylie's night at the Billboard Music Awards.

Source: Getty / Kevin Mazur/Billboard Awards 201 [5]

Source: Instagram user kyliejenner [6]

Source: Twitter user OfficialBBMAs [7]