Former Big Brother housemate Brian Dowling will replace Davina McCall as the host of the celebrity version of the reality show.
The Irish presenter will present the revamped show when it returns to Channel 5 next month.
Dowling, 33, said: "I am so excited about this opportunity to host one of the most talked about shows on TV. It is 10 years since I won Big Brother so what better way to celebrate and mark that anniversary than to be asked to host the new series.
"It's on a new channel and a fresh start for the show that has kept the nation entertained for 11 years and I am so excited to be a part of it!"
The final line-up of contestants has not yet been confirmed, but according to rumours, those tipped to appear include Amy Winehouse, Abbey Clancy, retired boxer Ricky Hatton and Amy Childs from The Only Way is Essex.
Jeff Ford, the Channel 5 director of programmes, said: "As The Ultimate Big Brother housemate, Brian is the perfect man to be at the helm of Big Brother's new incarnation. Emma, meanwhile, is a consummate professional – as well as being a self-confessed superfan.
"Their combined expertise and first-hand experience of the show will bring an extra dimension to Big Brother when it returns this summer."