The programme is usually presented by Cat, 48, and co-star Ben Shepherd, 50, Monday to Thursday, followed by Alison Hammond , 50, and Dermot O'Leary, 51, on a Friday.
Appearing alongside co-star Bruno Tonioli, 69, the music mogul, 65, sat down with Alison Hammond and Dermot O'Leary on Friday's instalment of the ITV show.
The ITV presenter, 50, usually hosts the show with Dermot O'Leary, 51, every Friday but has been replaced by Josie Gibson, 40, and Sian Welby, 38, for the last few weeks.
The 57-year-old appeared on ITV show alongside Dermot O'Leary, 51, and Sian Welby, 38, to show how he makes his dish of slow cooked lamb shoulder with Marmite.