The fourth Bridget Jones film faces a two-year delay due to the ongoing actors’ strike.
Actress Renee Zellweger, 54 – star of the romantic comedy – has signed up for the next episode but only had a small window to film.
With Hollywood work stoppages delaying production over pay, time is running out for filming to begin.
A source said: “It’s a nightmare for movie bosses. It took forever to get everyone on Bridget Jones 4, and now the strike is putting it in jeopardy.
“Renee is one of the biggest names in Hollywood and has already signed on for several films over the years to come.
“She had a tight window to shoot Bridget and the hit meant she could miss completely.”
The first film, Bridget Jones’s Diary, was released in 2001 and became a worldwide sensation, grossing over £200m at the box office.
It spawned two sequels – Bridget Jones: The Edge of Sanity (2004) and Bridget Jones’ Baby (2016).
Last October, author Helen Fielding confirmed she was working on her fourth feature film, based on her 2013 book, Mad About the Boy.
Helen said: “Yes, I’m working on it and I really hope it will happen.
“Every film that is made is a miracle – it’s really difficult to make films and do them well.
“But I’d like to see it on screen.”
Representatives from Universal Films and Zellweger did not respond to The Sun’s request for comment.