Dr. Luke will be joining Keith Urban and Jennifer Lopez on the judging panel of American Idol. Dr. Luke a.k.a. Lukas Gottwald is the third judge to be announced with another yet to be agreed upon. E! first reported the news.

Dr Luke
Dr Luke (L) with Katy Perry and Max Martin (R) with their ASCAP Awards in 2012.

Gottwald is a songwriter and producer who is responsible for the likes of Kelly Clarkson's 'Since U Been Gone'; Kesha's 'Tik Tok' and Katy Perry's 'California Gurls'. As Urban and Lopez are involved in the performance side of the music industry, Gottwald is likely to provide an interesting perspective when judging the televised singing competition. 

Gottwald was offered the job after it was reported Will.i.am turned down the opportunity to continue working on BBC's The Voice UK. Will.i.am has judged the show since its first season, three years ago, along with Tom Jones

Jennifer Lopez
Jennifer Lopez at a store opening in Brooklyn, New York.

Dr. Luke is a newcomer to the judging panel as Lopez and Urban have appeared on the show before. Urban appeared on the 12th season of the show which aired last year, whilst Lopez judged on the 10th and 11th seasons, airing 2011-2012. This season will see the three confirmed judges working together for the first time - which should make interesting watching! 

Previous judges of American Idol have included Nicki Minaj, Mariah Carey, Paula Abdul, Simon Cowell and Steven Tyler. The fourth judge of the upcoming season is rumoured to be Jennifer Hudson, although reports remain unconfirmed. There's still plenty of time for the show's producers to decide as American Idol's season 13 premieres does not air until January 15th 2014. 

Who do you think should be the fourth judge on American Idol?

Keith UrbanKeith Urban at the American Idol Finale Results party in 2013.