The 'Strictly Come Dancing' judge believes her former Mis-Teeq bandmate has the skills to survive in the Australian jungle and will beat her fellow celebrities at the show's notoriously gruesome challenges.
She said: "One thing I know about Sabrina is that she's very competitive.
"When it comes to the trials I think she will do incredibly, so watch out. She's a Mis-Teeq lady and we just get down and get on with it. She'll be fine."
However, Alesha thinks Sabrina was "crazy" to go on the show - which typically makes it contestants eat bugs, beetles and unusual cuts of meat - because she refused to dine on anything other than fast food when they toured.
She added: "Trust me, she won't eat kangaroo testicles. If she does, I'll eat my hat."
He told Closer magazine: "When I first heard she was going to do it, I felt proud and frightened all at once. I know she'll be the amazing girl she is, but I'm scared for her. It's tough in the jungle. I couldn't do it."
The 'Hollyoaks' actor admits he is finding it tough being separated from Camilla, who he has been dating since July 2008.
He added: "I don't like being out of touch. We usually speak constantly, this feels like my arm's been removed."