Bridget Jones 3: Cast filming three different endings to keep baby daddy under wraps

Renee Zellweger, Colin Firth and Patrick Dempsey will not find out which ending is chosen until the premiere

Renee Zellweger returns as eternal singleton Bridget Jones in Bridget Jones's Baby (Rex Features)

The year that Bridget Jones has her baby is finally here. Who the father is, however, remains unknown, even by Renee Zellweger herself.

The cast of Bridget Jones’s Baby are filming three different endings in a bid to avoid plot leaks and will not find out how the romcom ends until the premiere.

Zellweger will be “kept in the dark” along with Colin Firth who returns as Mark Darcy and newcomer Patrick Dempsey, who plays love rival Mark Qwant.

“It’s kind of brilliant,” she told the Sunday Express. “None of the cast knows who fathered Bridget’s baby or who she’ll choose as her beau. The plan is to keep us all in the dark, right up to the premiere.”

Renee Zellweger regains her classic Bridget Jones expressions (Rex)

Unlike the previous two movies Bridget Jones’s Diary and Bridget Jones: The Edge of Reason, Bridget Jones’s Baby will not be based on Helen Fielding’s book, Mad About the Boy.

Eleven years have passed since we last saw Bridget set to live happily ever after with Mark in 2004. Naturally, times have changed.

“She’s a bit more mature and has moved on, as we all have,” Zellweger told Entertainment Weekly. “I like that she tells what it’s like to be a woman in these really relatable situations. It’s so right to tell a story about Bridget in this stage of her life.”

Original director Sharon Maguire is at the helm, working on a new script written by Fielding with One Day author David Nicholls.

Firth reprises his role after telling The Independent last year that he was “ready for that moment”. “It would have to have somewhere to go,” he said when pressed to get cracking on the threequel. “Back at the time I said that a third one should only happen if we were telling a story about having moved into a different generation when we were all beginning to deteriorate a little bit.”

Bridget Jones’s Baby arrives in UK cinemas on 16 September.