It's like prom night all over again!
Lil' Wayne's label mate went all out in a sheer feathered pink frock that every single showgirl in Vegas would covet, while the gorgeous sculpture of a man that is River kept it classy in a simple tux.
Wonder if they were able to engage in some PDA at the event?
It just wouldn't be right if they didn't broadcast their love all over the place!
[Image via AP Images.]