AceShowbiz -

British actress/model Kelly Brook has once again bared all, this time for new Reebok advertisements. In the billboard ads for EasyTones trainers, the 30-year-old beauty poses naked, only wearing a pair of Reebok's footwear, which is designed to tone bums and legs while walking.

This wasn't the first time Brook poses sultry for Reebok. Back in May, the "Survival Island" actress posed for the footwear's ads showing her wearing a pair of knickers matched with a cropped T-shirt and a skimpy underwear and stressing that whatever you are doing, you can wear EasyTones while doing it.

And Brook apparently can't seem to be able to keep her clothes on as she has also recently peeled off her clothes for men's magazine Playboy and has earned a half-a-million dollar to pose naked for the mag later this year. The Playboy snaps are said will be "arty".

Moreover, Brook will also be seen naked in a lesbian sex scene for upcoming film "Piranha 3-D" which is due August 27 in U.S. theaters. On the project, she said, "It's just a big, fun B-movie - lots of boobs, blood, gore and drama. I don't think I'll be getting any Oscars for."