The incredible shrinking Renee

There seems to be less of Renee Zellweger than ever.

The actress who put on almost three stone to play the curvaceous Bridget Jones seems just as talented at taking it off.

Appearing at a charity concert in Los Angeles, 35-year-old Miss Zellweger looked at her most petite.

'She is very pale and while I've seen her looking slender before, she looked quite ill,' said a fellow concertgoer.

'When you live in LA you are used to seeing slim girls, but she is so skinny it's frightening.'

Miss Zellweger's weight has varied drastically throughout her career.

She was around 7st 7lb when she appeared in her Oscar-nominated role as murderess Roxie Hart in the film version of the musical Chicago in 2002. But as the down-to-earth Bridget Jones, she cut a much larger figure, fleshing out her tiny frame to wellrounded proportions.

For Bridget Jones's Diary in 2001 she simply gorged herself on pizza to put on weight before dieting back to her usual shape.

For last year's sequel, Bridget Jones: The Edge of Reason, she relied on the advice of a nutritionist.