Timberlake fears Biel exercise burn-out

Justin Timberlake is concerned that his girlfriend Jessica Biel is spending too much time at the gym.

The popstar is reportedly worried that Biel's rigorous fitness regime will cause her to become physically exhausted.

A source is quoted as saying: "Jessica is under a lot of pressure to stay in shape because there is so much competition among young actresses in Hollywood.

"Jessica loves to work out and so does Justin, but lately it seems like that's all she does.

"She's got an amazing body and Justin is trying to get through to her that she can afford to take some time out once in a while and have a burger, some beers and a day doing nothing."