Lovato in talks to perform at 'X Factor'

Demi Lovato is set to mark her comeback with a performance on the US version of 'The X Factor'.

The 18-year-old star - who left rehab in January after seeking treatment for "emotional and physical issues" in November – is in talks with producers of the highly-anticipated TV talent show to perform on one of the live shows after a judging role was ruled out.