Series 7 contestant Katie Waissel.
Leona Lewis
No, Bruno Mars was never on American Idol.
No she has never been a contestant on The X Factor.
Cheryl Cole has not been a contestant on The X Factor.
No, Taylor Swift was never a contestant on The X Factor.
No, she has never been a contestant on The X Factor.
Leroy Bell
yes
Times Red has: Played Themselves in "This Morning" in 1988. Played Themselves - Contestant in "The Xtra Factor" in 2004. Played Himself - Contestant in "The X Factor" in 2004. Played Themselves - Contestant in "The X Factor" in 2004. Played Themselves - Auditionee in "The X Factor" in 2004.
She was a contestant in 2008.
John and Edward.
yes