(Cover) - EN Showbiz - Heidi Klum loves hamming it up on her new TV show, but feels bad when her pranks make children cry.

The German model has been promoting her new programme Seriously Funny Kids, in which she plays jokes on youngsters. She loves the series and expects it to be a huge hit, as the reactions of the children are totally unscripted and often hilarious.

The 37-year-old who also presents fashion reality show Project Runway - revealed one joke which has stayed with her. She teased a little girl who was one of her biggest fans, and loved seeing how the tot responded.

There was a little girl, and she was so into fashion and she had seen me on Project Runway. I said, 'You know, I've been world's best-dressed woman for ten years. I'm so excited. Look at me. I have so much style and class.' I was really hamming it up, she giggled.

As I walked away, my phone rings. The girl picks up the phone, and... it was some journalist who called and said, 'By the way, we're putting Heidi on the cover of the worst-dressed person in the world, and you have to break it to her. She was so cute and she was so on my side. Then I came back and she had a breakdown... and I couldnt crack up because then she would have known it was a hidden camera bit.

The secret filming sections of Seriously Funny Kids are the parts Heidi relishes. She loves seeing how the children deal with the pranks, as their emotions are always written all over their faces.

I do pranks with them. I get to know so many kids and their personalities, but my favourite is always the hidden camera bits, Heidi explained while promoting the programme. It's hard for me because I can't crack up. I have to stay in that moment, and sometimes it gets serious. (C) Cover Media