Renée Zellweger is set to star in a third 'Bridget Jones' film.The actress has already expressed an interest in reprising the famous role and is prepared to once again pile on the pounds to play the hapless British TV reporter. A source told Britain's Daily Express newspaper: "The next film will leap forward 10 years. Mark Darcy and Daniel Cleaver are still on the scene and Bridget is about to give birth to Daniel's baby."Working Title, the company who produced the first two films, have already bought the rights to author Helen Fielding's third novel. The pressure is now on Fielding, who gave birth to her second child four months ago, to complete the book as soon as possible.The source added: "Helen Fielding has started on the book. Obviously her own baby daughter has stalled production a little but now that Working Title has signed on the dotted line, she'll be trying to finish the book as quickly as possible."Renée gained 25 pounds to play Bridget in the first two movies and perfected her English accent by using it on set even when she wasn't filming.