The blonde stars will take to the board and appear in the first heat of the diving contest when the show kicks off on ITV1 on 4 January.
Also preparing to make a splash in the first heat is Diversity dancer Perri Kiely, former EastEnders actor Ricky Groves and TV presenter Michaela Strachan.
Olympic diver Tom Daley will be coaching the celebrities and giving them his expert advice as they attempt to impress the judges with their newfound skills.
Ahead of the show's launch, the fivesome have donned their swimsuits and posed for a series of pictures together.
Reality star Gemma chose to wear a bright cerise all-in-one, which featured a racy plunging neckline, as she stood on the steps leading into the pool.
Gemma Merna, meanwhile, opted for an orange bikini with chain detailing around the knickers. She should be careful not to loose that two-piece as she jumps off the board!
Michaela, who co-hosted kids' programme The Really Wild Show in the 80s, is wearing a more sporty costume, and Ricky is in basic black swimming shorts.
Proving just how fearless he already is, Perri posed for his snaps while leaping off the top board as Tom looked on.
We can't wait to see these girls and guys in action!
Splash!, ITV1, Saturday 4 January.