The model, who is busy reinventing herself as an actress, nipped outside to sign autographs for the fans, who pushed photos through the railings.
And her low-cut knitted dress skimmed every curve, leaving little to the imagination.
Hi guys: Kelly Brook waves to her fans after recording the Paul O'Grady TV show outside the London Southbank TV Studios
Kelly was leaving after filming an episode of the Paul O'Grady chatshow. Perhaps she was visiting to talk about her latest stage role.
She is set to give ticket sales a boost after landing a role in Calendar Girls.
The 29-year-old has been persuaded to fill the role of Celia - aka Miss September - vacated by Jerry Hall.
And the model looked quite comfortable posing with just a couple of cherry-topped ice buns and ex-Corrie star Julie Goodyear to protect her modesty in promotional pictures.
On great form: Kelly signs autographs for her fans
In Celia's big scene in the play, in which she poses behind a selection of iced buns, the character of Chris notices the cakes aren't quite covering Brook's 32E assets and shouts: 'I think we're going to need considerably bigger buns.'
Brook is part of the current production's third cast change, who will take over from the current line-up on November 3.
This isn't the first time Kelly has stripped off on stage. Last year she cavorted around in a bikini in Fat Pig in the West End.
