Bridget Jones is left asking "who's the daddy?" in the first full trailer for the new film starring Renee Zellweger. The hapless television producer finds herself caught in another love triangle in Bridget Jones's Baby. She must try to work out if the father is ex-boyfriend Mark Darcy, played by Colin Firth, or her new boyfriend, Jack, played by Patrick Dempsey. The film is the third instalment of the franchise, and comes 12 years after Bridget Jones: The Edge Of Reason. The movies are based on Helen Fielding's books about a woman who is unlucky in love and prone to embarrassing herself in social situations.Fielding released her third book, Bridget Jones: Mad About The Boy, in 2013 but it is not known how closely the film sticks to its plot. Emma Thompson, who plays Jones' doctor in the movie, wrote the screenplay. The film is released in cinemas in the UK on 16 September.