Posh determined to stay waif thin forever

Having just turned 36, and determined to remain stick-thin, Victoria Beckham has embraced a new fitness fad taking Hollywood by storm.

The mother of three, who is said to be trying for a baby girl, has been doing four classes a week of the punishing Core Fusion workout.

"Beckham was introduced to it by her Desperate Housewives pal Eva Longoria and they are now obsessed with it," says a source. "It combines core conditioning with Pilates, the Lotte Berk method designed by a German ballet dancer, interval training and yoga. It's hell!"