The German beauty – who is one of the world’s most successful supermodels - admits she has to be sure of her appearance otherwise her self-doubt would show in images of her.

She said: ‘It’s part of being a good model - you have to become the fantasy for that moment. I know who I am as a person, but when you get to play different parts in front of the camera, you have to be that girl or this girl, what’s wrong with that? There are worse jobs.’

The mother-of-four is renowned for regaining her stunning figure after each of her pregnancies and believes a lot of it is down to luck.

She said: ‘I always eat sensibly and I think a lot of it has to do with genes. I think I’m a little bit lucky.’

Heidi - who is married to singer Seal - admits being a mother has calmed her down as she will no longer do risky photo shoots.

The ‘Germany’s Next Top Model‘ host told Britain’s Tatler magazine: ‘I still have the same values in life but I’m definitely not as crazy any more. Not that I was ever crazy-crazy because that’s just not who I am, but I would do wild photo shoots. For example, yesterday Rankin was flaming up the girls with fire for ‘Germany’s Next Top Model‘. I don’t want to do dangerous things any more.’

The supermodel – who recently launched her own range of maternity clothes Loved and Lavish – has been enjoying creating outfits and thinks little Leni could come up with some good ideas.

The mother-of-four said: ‘My daughter Leni was there when I designed the floral pattern for some of the fabrics. She was like, ‘Wow, so many of them.’ I’ve been thinking that maybe one day I’ll have her create a pattern for me too.’

Heidi – who is married to singer Seal and gave birth to youngest daughter Lou last October – says the names for the lines were inspired by how she felt when she was pregnant.

She is quoted by website Celebrity Baby Blog as saying: ‘Loved was inspired by the love surrounding you and your baby while you’re pregnant. We came up with Lavish because there’s no grander expression of everything you want to give yourself and the child growing within. It’s all about the extravagance of love.’

Heidi – who also has sons, Henry, four, and Johan, three – wanted to create clothes for pregnant women as she knows how important it is to look and feel good.

She said: ‘I experienced some style challenges during my four pregnancies, so I wanted to create maternity fashions that allow women to show off their beautiful shapes. As my bump grew, I would look in the mirror and be in awe of the changes happening to my body. I was creating a nourishing space for this new life. My clothes are all about making you feel great during this process.’