Patrick Dempsey to join Renee Zellweger, Colin Firth in ‘Bridget Jones 3’

Titled 'Bridget Jones' Baby', the threequel is finally due to start shooting in October

Grey’s Anatomy actor Patrick Dempsey is reportedly “in final negotiations” to join the cast of the third Bridget Jones movie.

Renee Zellweger and Colin Firth are both reprising their roles from the first two films, though Hugh Grant will not be returning for the “threequel”.

Titled Bridget Jones’ Baby, the film is understood not to be based on Helen Fielding’s third novel in the series, Bridget Jones: Mad About The Boy, which was published last year and controversially killed off Firth’s character Mark Darcy.

Instead, the film is said to be based on several newspaper columns written by Fielding. Dempsey’s role is being kept under wraps, Deadline reports, and Sharon Maguire, director of the original 2001 Bridget Jones film, is attached to direct. Fielding has worked on the screenplay with One Day author David Nicholls.

Both 2001’s Bridget Jones’s Diary and its 2004 sequel Bridget Jones: The Edge of Reason were big hits at the box office, grossing over $540 million (£350 million) worldwide between them. A third movie has been in the works since 2009 but is finally due to start shooting in the UK on October 2.