Grab your barf bag -- you may need it.

Amber Rose attended the first-ever People Magazine Awards on Thursday night at Supper Club in Los Angeles, and when Juvenile's "Back That Azz Up" came on, she couldn't help but grind her enormous derriere against Chris Brown. Chris was clearly loving every second of it, and he was so distracted by Amber's butt, his gum nearly dropped straight out of his mouth. Don't believe us? Watch the video above...

Since her split from estranged husband Wiz Khalifa last October, Amber has definitely been loving the single life, but who's watching after her young son Sebastian? Seems like the nanny has been working overtime lately...