Rihanna Delivers Booty-full Wake Up Call to Passed Out Friend

It’s Rihanna‘s birthday week … she can put her cake in your face if she wants to.

One of Ri Ri’s pals couldn’t keep up with her ongoing “Dirty Thirty” celebrations and passed out early, so the “Umbrella” singer twerked in her face while Lil Kim filmed the whole thing.

The friend didn’t seem to mind too much, but star made it clear that you better not fall asleep on her watch unless you want a face full.  Then again …

Instagram / MEGA