The show has been charting the adventures of nineties and noughties groups such as Atomic Kitten, 5ive and B*Witched as they get back together.
And now the channel has announced that the once-massively-popular boy band will be joining the roster of acts on the show.
Simon Webbe, Lee Ryan, Duncan Jones and Anthony Costa first found fame as Blue back in 2001, enjoying three No 1 singles before splitting in 2005.
Technically they are not reforming for the show, because they were already on the comeback trail after representing Britain at the Eurovision Song Contest in 2011 (and finishing 11th, fact fans).
They released a new album, called Roulette, in several European countries earlier this year - and a UK release is planned to follow soon.
We told you recently how a tour is apparently in the pipeline after the show.
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