Kara DioGuardi

Kara DioGuardi is a singer-songwriter, record producer, music publisher, A&R executive, and TV personality. Beginning in 2009, she was added as a fourth judge on American Idol.

DioGuardi will voice herself alongside Idol host Ryan Seacrest, and fellow judges Randy Jackson, Ellen DeGeneres, and Simon Cowell.

Guest stars in season 21

Seth Rogen • Kevin Michael Richardson • Matt Groening • Chuck Liddell • Jonah Hill • Neve Campbell • Smothers Brothers (Dick Smothers • Tom Smothers) • Peyton Manning • Eli Manning • Cooper Manning • Kim Cattrall • Huell Howser • Jordan Nagai • Mitch Albom • Anne Hathaway • Gary Larson • Eartha Kitt • Jackie Mason • Chris Martin • Bob Costas • Wren T. Brown • Sarah Silverman • Angela Bassett • Sacha Baron Cohen • Yael Naim • Joe Mantegna • Jane Kaczmarek • Maurice LaMarche • Eddie Izzard • Don Pardo • Kelsey Grammer • Ryan Seacrest • Randy Jackson • Ellen DeGeneres • Kara DioGuardi • Simon Cowell • Rupert Murdoch