Steph McGovern and Joe Thomas are the final two contestants who have signed up for Netflix show 'Bear Hunt'.
The TV presenter and the 'Inbetweeners' actor are said to have flown to Costa Rica this month to take part in the brand-new programme, which stars Bear Grylls and is hosted by Holly Willoughby.
A production insider told The Sun newspaper: "Signing up Steph and Joe have made this one of the most diverse and unusual celebrity line up ever seen on a show like this.
"The dozen celebrities come from incredibly different backgrounds - whether it's ballroom dancing, singing, sport or interior design. They'll each bring something to the mix.
"None of the choices are obvious - particularly not Steph and Joe, neither of whom have been on our screens in some time."
Spice Girl Mel B, former tennis pro Boris Becker, 'Strictly Come Dancing' head judge Shirley Ballas, and models Lottie Moss and Leomie Anderson are also said be part of the inaugural line up.
In the upcoming show, survival expert Bear will put the stars through their paces as he challenges them to survive in the Costa Rican jungle, before chasing down strugglers in a cat-and-mouse style "Bear Hunt".
Changing Rooms star Laurence Llewelyn-Bowen, former rugby star Danny Cipriani, 'Ted Lasso' actor Kola Bokinni, singer Una Healy, and rapper Big Zuu are also expected to take part in the programme.
The Saturdays star Una is said to have signed up for the show to "show a different side to her".
A source previous told the publication: "Netflix have chucked a serious amount of money at 'Bear Hunt' and they have worked hard to get celebrities you might not expect to find in the Costa Rican jungle.
"Una has signed up to try and show a different side to her.
"People know her for The Saturdays, and for her short-lived fling with David Haye.
"Taking part in 'Bear Hunt' will show a side of her that the public haven’t seen before."
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