Justin Timberlake Warns Jessica Biel To 'Slow Down'

Justin Timberlake is worried that his girlfriend Jessica Biel is heading for a burn-out due to her exhausting diet and fitness regime.

The concerned 27-year old fears that if the Elizabethtown star doesn’t slow down she will wear herself out, and has advised her to take a chill pill.

A source tells Showbiz Spy: "Jessica is under a lot of pressure to stay in shape because there is so much competition amongst 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."