Her ex Mario has also had experience in the Big Brother house, coming fifth in the show in 2013.
Girls Aloud singer Sarah Harding will also be joining Lucy on the Saturday night show and said: "I'm really excited but a bit nervous about what it is going to be like doing Tumble! I'm really looking forward, but also a little bit scared, about all the training I'll be doing ... but at least it beats going to the gym!"
Rounding out the host of celebs are Ian 'H' Watkins from Steps, fitness legend Mr Motivator, Loose Women's Andrea McLean, Sugababe Amelle Berrabah, boxing champion Carl Froch, Eastenders actorJohn Partride, actor Bobby Lockwood, and Dynasty star Emma Samms.
Joining Louis on the judging panel are former Olympian Nadia Comaneci, Commonwealth Games champ and sports broadcaster Craig Heap and cirque artist Sebastian Stella.