Movie hunk Colin Firth will only do a third Bridget Jones movie if author Helen Fielding can come up with a drastically different storyline.

Firth, who stars as Renee Zellweger's love interest in the films, is convinced that BRIDGET JONES 3 could only be a box office smash if it contained radically new ideas and characterisations.

The 45-year-old actor says, "I wouldn't want to do a third Bridget Jones film that just went over the same ground.

"However if it was about a sad, unhealthy bloated DARCY (Firth's role), and CLEAVER (Hugh Grant's character) as a pathetic ageing Don Juan with a fake tan and BRIDGET being even more neurotic, it might be good."