01/08/2014 07:54 BST | Updated 01/08/2014 08:00 BST

Heidi Klum Topless: Designer Zac Posen Gets To Grips With 'Project Runway' Star In Instagram Photo (PIC)

Heidi Klum is obviously very good friends with designer Zac Posen judging by the latest pic the supermodel has shared on Instagram.

The 41-year-old was snapped posing in nothing but her designer knickers but luckily Zac was on hand (literally) to cover her modesty.

Not that Heidi has anything to be modest about - she might have had four children but she's still sporting an impressive washboard stomach.

The pic appeared online ahead of the first episode of the new series of 'Project Runway' in the US, which Heidi hosts and Zac appears as a judge on.

She captioned the snap: "@zac_posen ....I need something to wear for tonight's @projectrunway @lifetimetv."

Heidi has previously spoken about how nudity is no big deal for her after growing up in an easy-going family environment.

She told Tatler magazine: "'My parents are still naked. I mean, it’s not like we’re hippies and we run around naked, but if they happened to be in their room changing or something or someone comes out of the shower, they’re not, like, 'Oh my God. No. Close the door.''

More recently, she declared that she wouldn't feel comfortable modelling underwear on the catwalk now she's in her forties.

"I think that would feel, you know, a little uncomfortable," she said.

We can't see any reason why it would be.

Photo gallery Heidi Klum See Gallery