Renee Zellweger has reportedly agreed to star in a third 'Bridget Jones' movie - although film bosses have promised she won't have to pile on the pounds this time.

The Sun reports that the slim actress, who famously bulked up twice to play the loveable character, will apparently appear at the start of the new film stepping on the scales after reaching her target weight.

The actress gained two stone on both occasions to play the role despite health concerns over gaining that amount of weight so quickly and she is reluctant to do a repeat performance.

Oscar-winner Colin Firth, who played uptight human rights lawyer Mark Darcy, has previously said a third film could be "far more interesting".

Meanwhile, Hugh Grant has reportedly been lined up to play lothario Daniel Cleaver once again.

Following her books 'Bridget Jones's Diary' and 'Bridget Jones: The Edge Of Reason', on which the first two films were based, author Helen Fielding continued the further adventures of Bridget Jones in The Independent in 2005.

The columns saw Bridget's relationship with Mark fall into difficulty when she found herself pregnant by her dastardly ex-boss Daniel!