Heidi Klum will strip off for 'Project Runway'.

The 38-year-old beauty has agreed to bare all in the promotional campaign for the upcoming ninth series of the TV competition, which she has hosted since 2004.

Lifetime TV president and general manager Nancu Dubic - who stepped in a year ago to revamp the channel's reputation - said she chose the naked image of Heidi realising that she didn't need to look any further for a "brazen, strong, confident and sexy" model who embodied the channel's new values.

She said: "It's Heidi f***ing Klum!"

According to the Hollywood Reporter, Heidi posed for the pictures last week but has not yet signed off on the final images to be used.

This is not the first time Heidi - who raises four children with husband Seal - will have stripped in public.

She appeared on 'The Ellen Degeneres' show in 2009 whilst pregnant with her fourth child to charity auction the Temperley dress she was wearing - and removed it whilst she was still on the set.

Heidi said: "I'll give you it anytime. You want it right now? OK."