The actress's professional skating partner Dan Whiston has torn a hamstring and Jen has tweeted that she doesn't want to go on without him.
"For all those asking, if Dan can't skate on Sunday then I won't be. So I'm afraid I may be hanging up my boots before it's even begun," she said.
However, it seems Dan is hoping he'll still be able to compete.
The Daily Star quotes a show insider as saying: "Thankfully, it's just the first week. That means the routine isn't that challenging so he may be able to wing it on the night.
"He's a real trouper and says he'll get on the ice no matter what. Jen's really worried - but for her it's Dan or nothing."
The show has been plagued with injuries already, with former pop star Chesney Hawkes, Sugababe Heidi Range and EastEnder Laila Morse among those to have hurt themselves on the ice.