Kelly Brook at the GQ Men of the Year AwardsThere is much appreciation around the world for Kelly Brook's natural assets. But Transport for London chiefs have insisted it's bigger buns they're after.

The TfL bosses have taken offence to Kelly's latest poster campaign, for West End show Calendar Girls, after deciding that the iced buns covering her considerable chest weren't covering quite enough.

Posters featuring the actress holding cherry-topped iced buns to protect her modesty are appearing throughout London's Tube station, but the image has so far been edited three times.

Kelly is due to make her debut in the play today, having replaced Jerry Hall in the role of Celia at the Noel Coward Theatre.

And Kelly's possible nudity has already caused her some worries.

She told the Daily Mail: "A few of the girls in the cast are more game than others to go nude.

"But if I really go for it in getting my clothes off then it will be seen in a totally different context to everyone else – as in 'Kelly gets her kit off again' – so I shall have some cup cakes strategically placed when I go naked on stage."

But in the eyes of Transport for London, those cup cakes just aren't cutting it.

The show's producer David Pugh revealed: "[TfL] are worried about titillating customers," and a TfL spokesman confirmed that they had requested "a few tweaks" to ensure the advert complied with its policy.

Just remember chaps... it's not the size of the buns, it's what you do with them that counts.

Click here to see Kelly's original pose and the 'tweaked' version.