Billboard Hot 100 Fest
POTW: Rihanna, Justin Bieber, Katy Perry, Lady Gaga, No Doubt
Rihanna gets frisky with her mother, Katy Perry goes cowgirl, Lady Gaga takes on Howard Stern and No Doubt and Major Lazer hit the studio. It all happened this week, and we've got the pics to prove it.
News of the Week: Billboard's 5 Most Popular Stories
1. Poll: Best '90s Video?