Caroline Flack and Olly Murs are to return as hosts of TV’s X Factor spin-off.

The duo have been signed up for a further series of ITV2’s The Xtra Factor after proving to be a successful double act in 2011.

Caroline – who last year dated One Direction star Harry Styles – will cover the audition stage of the contest alone while chart star Olly tours the US.

However, he will record items for the series and will be on screen for the live shows in the autumn.

Dermot O’Leary has already been confirmed as host of the main show.

Auditions begin in Liverpool tomorrow with Geri Halliwell standing in as a guest judge, and she is reported to be the preferred choice to become a permanent replacement for Kelly Rowland.

Mel B has also been signed up for a guest role on the panel.

Caroline said: “Even though Olly and I won’t be reunited in person until the live shows we will be together all the way in spirit, he’s bound to be calling me mid-interview to check what has been happening on the judges tour to ensure he doesn’t miss out on any crucial gossip.”

Olly said: “I know it’s going to be a great year and we’ll be grilling the judges and contestants more than ever before.”