The new Channel 4 show, due to begin later this month, sees 12 famous faces tackling winter games such as bobsleigh, toboggan and cross-country skiing.
Airing nightly, the series will decide eliminations based on a live ski jump.
Childs and Sinitta will be joined by fellow female contestants Anthea Turner, Melinda Messenger, Kimberly Wyatt and Laura Hamilton - who stepped in when Tara Palmer-Tomkinson decided to quit the competition.
5ive's Ritchie Neville - who is a replacement for injured Flash Gordon star Sam Jones - is also in the photograph, along with Marcus Brigstocke, Nicky Clarke, Henry Conway, Darren Gough and Sir Steve Redgrave.
The Jump is expected to begin on Channel 4 on January 26.
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