Heidi Klum's kids don't get upset about her bikini posts on Instagram - because they've seen her "sunbathing topless"

She said: "They know I worked in the lingerie industry for a long time.

"They've seen me sunbathing topless at home. Obviously not when their friends are coming over... So, yeah, they're not like, 'Oh, my God! What are you posting?!' "

Heidi - who is dating art curator Vito Schnabel - admitted she feels at her sexiest now because she's still got her holiday tan.

She told 'Extra': "Because I came back from vacation and I still have my tan... turn around from every angle, everything is nice and brown. I feel like a marshmallow that's just been roasted."

Despite her envious figure, the 'America's Got Talent' judge insists she doesn't have a consistent workout regime and she will indulge in her favourite calorific treats whenever she fancies them.

She said: "Whenever I can [work out], I do, and when I can't, I can't. I don't beat myself over it... I'll go in the attic where I have my little treadmill... You don't need a trainer, you can really do things yourself.

"I eat what I want to eat, but not all the time. I don't eat burgers and pizza and chocolate all the time, but I do eat it!"

Meanwhile, the blonde beauty revealed her show 'Project Runway' will be setting a new challenge for the designers in the upcoming next season.

She explained: "We have models of all sizes, which is something for all the seasons we have never done... A lot of the designers were not happy about that. If you want to be a good designer, you need to be able to design for everyone."