Britney causes worry over sudden weight loss

Troubled singer Britney Spears has caused worry amongst her friends and family, due to her sudden weight loss.

The "Toxic" singer has stunned all the critics by flaunting a washboard stomach and toned legs just weeks after being photographed eating junk food and sporting a flabby waistline.

Her new figure has sparked concern that she's losing weight too quickly.

A source told More magazine: "She loves her new shape. But no one wants to see her looking as thin as Nicole Richie. Her mum is worried she could be doing it too quickly."

Britney, 25, failed to shed the post-pregnancy weight after giving birth to her sons, Sean Preston, who turns two in September, and eight-month-old Jayden James.

Britney is now working out with a personal trainer and taking regular dance classes.

She has also ditched calorific treats for a low fat diet.

The source added: "She's eating lots of vegetables, fruits, grilled chicken for lunch and sushi for dinner. She does allow a cheat day once or twice a week."