Heidi Klum will still be a model when she is 80 and ”on crutches.”

The 35-year-old beauty – who raises three children with her husband, singer Seal – has no intention of ever quitting the catwalk.

Heidi laughed: “I’ll be 80 on crutches at the Victoria’s Secret fashion show hopping down the runway, groaning for my grandkids to help me down!”

The German-born star – who is the new face of the Victoria’s Secret Perfect One bra – also revealed she has made many fashion mistakes in the past, but feels sexier than ever.

She told Fox News: “I’ve done things like wearing a sexy dress with granny pants underneath or bloomers with my tight jeans instead of a G-string.”

“So I’ve learned feeling sexy is like an onion – the layering, not the scent!”

Heidi admits motherhood has made it harder to keep in shape and she has to follow a sensible diet and exercise regime.

She said: “The only advantage after having children is having a bigger smile on my face.”

“But as far as my body goes, there was definitely more disadvantages. I really have to eat better and work out more now.”

Heidi has a four-year-old daughter, Leni, from a previous relationship. She also has two sons with Seal – three-year-old Henry and Johan Riley, two.

Supermodel Heidi Klum served up a surprise for passers-by when she appeared topless on the balcony of a hotel on Sunset Boulevard in Los Angeles for a photo shoot.

The photo shoot was for clothing company Jordache. Klum, who is married to singer Seal, was wearing only jeans and was shot by Brett Ratner, who directed such hits as ‘Rush Hour’.

Contactmusic.com quoted her as saying: ‘I was standing there with my top off while cars were driving by and people were looking up every once in a while. It was kind of funny. I hope no-one got a snapshot from down there.’