Six men and six women will dress in tight Lycra and be given gladiator-style names for the series, due to air in March.
Other contestants lined up for the men's event include: athlete Iwan Thomas; Jade Goody's former partner Jeff Brazier; ex-'EastEnders' actor Marc Bannerman, who played Gianni de Marco; showjumper Oliver Skeete; and children's TV presenter Mark Speight.
Grappling against Silvstedt and Lawler will be Liberty X singer Michelle Heaton, Page Three pin-up Leilani Dowding, former tennis star Annabel Croft, with the D-list line-up completed by 'Wheel of Fortune' hostess Jenny Powell.
The winner of each group will be crowned King and Queen of the ring.
'X Factor''s Kate Thornton will present the show, with former WWF wrestler Rowdy Roddy Piper taking on co-presenting duties.
The news comes as ITV announced yesterday it was pulling its Nigel Marven Saturday night adventure show 'Scream!... If You Want to Get Off' after just three episodes when ratings dropped to 3.7m or 18% audience share.
ITV regularly secures more than 7m in this slot with reality shows like 'X Factor' and 'Pop Idol'.
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