Flack will front ITV2's X Factor spinoff show for a second year with Olly Murs, who has already told fans he will return.
She also confirmed reports that her 'Heart Skips a Beat' co-star will miss the auditions, leaving her to present the programme alone for the first few weeks while Murs supports One Direction in the US.
Flack wrote on Twitter: "London excelled in loveliness today! Super delighted that I'm back working on Xtra Factor this year with Olly..will miss him in auditions."
The 32-year-old's love life has been under intense scrutiny over the past six months, following her controversial and short-lived relationship with One Direction singer Harry Styles.
Flack and Murs were signed up by ITV in 2011 to replace Konnie Huq.
The X Factor and Xtra Factor will both return in August on ITV1.
> Caroline Flack breaks silence over Harry Styles romance