Heidi Klum proved she still cuts it as a lingerie model in the new ad for Project Runway.

The 39-year-old slipped into a racy bra and knickers to promote the 10th season of her fashion reality show.

In a nod to the programme’s design competition, she can be seen posing on a bed of silver scissors in a behind-the-scenes video from the shoot.

Heidi gave the signal she was OK despite her spiky resting place

The mother-of-four looks lean and toned in the skimpy outfit and easily works her magic for the cameras.

While her estranged husband Seal has moved on from their January split – he was photographed with a bikini-clad woman earlier this month – Heidi has denied she’s sparked up a new romance with Thomas Hayo, her Germany’s Next Top Model colleague.

She revealed: ‘He is not, nor was he ever my boyfriend. I think he is a great guy, but not for me.’

She recently admitted that she is wary of another legal union – although she did love being married to musician for seven years.

She told the weekly newspaper Bild am Sonntag: ‘I don’t know if I’ll get married again. Although I really enjoyed being married. I’m a dreamer. I loved our annual fairy tale weddings that were our big family parties. But sadly, it somehow didn’t work out.’

Heidi said that she is generally satisfied with her life now as a single woman.

Heidi added: ‘I think everyone should work on their dreams. I try to. I look into the future, concentrate on my family and I have to say that I’m happy. There are worse things in life than a separation.’

Project Runway premieres its 10th season Thursday, July 19 at 9 p.m. (EST) on Lifetime.

@Mail Online