Kelly Brook said she was having a ‘naked month’ as she unveiled a nude billboard of herself.

The 30-year-old actress/model and former Strictly Come Dancing contestant launched the daring advert for Reebok EasyTone trainers outside Battersea Power Station in south London.

The huge billboard shows her lying down wearing nothing but a pair of trainers.

She said: “It’s a bit scary having yourself up on a billboard, but I suppose I’ve got to get used to it because I just did a shoot for Playboy.

“It seems this month is my naked month.”

Kelly recently returned from the USA where she was promoting her new film, Piranha 3D. “It’s a big popcorn movie. It was fun to work on and it seems to have got a good response. The fans seem to love it.

“If you like horror and you like fish then go and see it,” she said.

The country’s biggest girls’ group, Girlguiding UK, is campaigning for airbrushed celebrity photos to be labelled, but Kelly said she was not completely against the process.

She said: “Airbrushing has been around since the Fifties. It’s what Hollywood was built on and I’m a big fan of Hollywood and that whole era.”

But she added: “If people are being slimmed down in photographs then I think that should definitely be pointed out because you don’t want to portray something that is unrealistic and unachievable to young teenage girls.”