Renee Zellweger - Bigger, the better!

Tinsel town is buzzing with rumours that the latest leading lady to go under the knife has been actress Renee Zellweger, especially after she turned up for the premiere of her new movie showing off a cleavage that looked brand new.

Zellweger had tongues wagging when she stepped onto the red carpet for the London premiere of her latest flick Miss Potter.

The actress, whose weight has swung like a pendulum between chubby to too thin, had people wondering if her enhanced breasts were the result of latest brassiere technology or breast implants, reports the Daily Mail.

In her first film since the break up of her 128 days marriage to singer Kenny Chesney in Dec 2005, the stunning 37-year old actress takes on the role of Beatrix Potter, the British author who gave the world the children’s book The Tale of Peter Rabbit.

Miss Potter marks the return of Zellweger, who took a hiatus after the collapse of her marriage, to the big screen.

And, she will certainly have her hands full, for not only will she be starring in Case 39 and but also lending her voice in Bee Movie, she's also signed up for a third 'Bridget Jones' Diary.