Washington, Sep 2 : American actress Jessica Biel is said to be so obsessed with healthy eating that she keeps on teasing her boyfriend Justin Timberlake about his eating habits.

Biel, 27, who has been dating the `SexyBack' singer for around two years, always pokes funs at him when he eats cheese or dessert.

"Jessica will always pick healthy starters on the menu and if Justin orders a dessert or cheese, she teases him. She's only joking but I'm sure it can get annoying if it's happening all the time," Contactmusic quoted a source as saying.

"Justin clearly loves Jessica but no-one likes to be told what to eat and how to exercise all the time. It would be great if she relaxed a bit and maybe spent a bit more time chilling out with Justin," the source said.

Timberlake, 28, is concerned Biel's desire to have a toned physique is turning into an obsession, with her exercising four hours a day, six times a week, sometimes rising at 5.30am to fit in her gruelling work out.

"She starts each day with a jog, followed by two-hours of squats, bench presses, lunges and crunches. She also swims three times a week, and does yoga twice a week, as well as biking and boxing," the source explained to Britain's Look magazine. (ANI)