Photo SpecialWhose Side Are You On? Christina Aguilera vs. ...
From The Wanted to Kelly Osbourne, see who's hit a sour note with the singer
Credit: Amanda Schwab/Startraks; Inset: NBC
Updated: Wednesday May 09, 2012 | 06:00 PM EDT By: Kiran Hefa
More from PEOPLE
- Kim Richards Travels to Mexico to Watch Her Daughter Brooke Get Married
- Read the Cover Story – Tess Holliday: The World's First Size 22 Supermodel!
- First Look! Matt Damon is Lost in Space in Ridley Scott's The Martian
- Our Body Issue Stars React to Nice Tweets about Themselves
- Prince Harry Finally Meets Niece Princess Charlotte, PEOPLE Confirms