Beyonce

Aly & AJ Michalka, Ashlee Simpson, Carrie Underwood

Chingy, Chris Brown, Clay Aiken

Gwen Stefani and Gavin Rossdale, Jamie Foxx, John Mayer

Jojo Levesque, Josh Groban

Snow patrol

Paris Hilton, Taylor Hicks, Tori Spelling and Dean McDermott

Katharine McPhee

Source: WENN