The scorching Nevada temperatures call for celebrities to wear as little as possible (no surprise here), which translates into lots of little black dresses (yowza, Jordin Sparks!) and white hot numbers. But, of course, there are the usual over-the-top outfits (really, Kesha, a ball gown?) that we associate with Sin City.
Check out all the Billboard Music Awards red carpet fashion in our slideshow and tell us which looks are your best and worst dressed picks.