The script for the third Bridget Jones instalment is still being written, its producer has said.

But Tim Bevan, the co-chairman of Working Title Films, said the movie, Bridget Jones's Baby, was beginning to take shape.

"The script is being written. Bridget Jones's Baby is like herding cats, but they're beginning to fall into line," he said, reported Radio 1 Newsbeat online, confirming that the cast had been approached about the third film.

The last Bridget Jones film, The Edge Of Reason, came out in 2004, with Renee Zellweger, Colin Firth and Hugh Grant reprising their roles.

Earlier this year, Hugh revealed that he would gladly reprise his caddish role as ladies' man Daniel Cleaver for Bridget Jones 3.

"They haven't quite cracked the script. But when they do, I'm sure we'll make it," he said.