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
- 'Munchausen Mom' Case: Daughter Says She Was Never Abused
- Read the Cover Story: Jill and Derick Dillard Share Their Baby Boy's Dramatic Arrival
- The Kardashians Celebrate Kourtney's Birthday With Sweet Messages and Throwback Photos
- Demi Moore Lists NYC 'Mansion in the Clouds' for $75M
- Doris Day On Saying Goodbye to Rock Hudson: 'I Was In Tears'