The Great British Bake Off and EastEnders stars have been practicing for the fifth series of the BBC dance contest, which returns on February 16.
They join previously-announced contestants Tim Vine, Ricky Hatton, Nina Conti, Jon Culshaw and Natalie Cassidy.
Jones told us that she believes Hollywood will put on an "amazing" Let's Dance performance, adding: "He started practising ages ago.
"Jon Culshaw and Paul Hollywood are taking it incredibly serious. I think those two will probably be strong contenders."
Asked if Hollywood's Great British Bake Off co-star Mary Berry will make a cameo for his dance, Jones stated: "I hope so, that would be great, wouldn't it?
"I'd love to see the pair of them. They've become national treasures in the last year or so."
The One Show host,