The two new Xtra Factor hosts, who have taken over from Konnie Huq, will make their debut on the ITV2 spinoff show this weekend.
"He gets his hair blow-dried for half an hour."
The Xtra Factor launches on Saturday at 9.15pm on ITV1.
Flack is also a team captain on new ITV2 gameshow Minute To Win It.
> Xtra Factor Caroline Flack: 'I try to make Gary Barlow cry'
Watch the Xtra Factor trailer below: