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  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  for her first time, and the week is only going to get more exciting as they prepare to watch their sister, Kim Kardashian , marry Kanye West  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 
Source: Instagram user kyliejenner 
Source: Twitter user OfficialBBMAs