US X Factor judge Demi Lovato is leaving the show after two seasons so she can dedicate next year "completely and entirely to music".

According to The Hollywood Reporter, show creator Simon Cowell said: "I always knew she wasn't coming back because she's touring, so I knew that."

Lovato said "I started the show being a singer and a musician, and so I'm going to go back to that. It's been really great, but I'm so excited for 2014. I'm going to dedicate it completely and entirely to music – touring and making a new album. Possibly releasing one."

Speaking about what she will miss about the show she said "Being able to sit next to Kelly and Paulina and see them twice a week, and also helping mentor the contestants."