LONDON: Heidi Klum, who is expecting her fourth child, says her legs and butt will ''explode'' in her final month of pregnancy, but is confident she will get back into shape quickly.

Heidi Klum is worried her butt will "explode".

The pregnant supermodel - whose raises three children with husband Seal, and is expecting a daughter in October - always piles on the pounds in the last month of pregnancy, but is not worried about shifting her baby weight.

She said: "The last month is unbelievable, how rapidly your stomach goes. It's huge! The thighs, the butt - everything explodes in the end.

"It's bizarre. Just as it's a miracle that you can grow a human being in your belly, it's a miracle that your body goes back to normal again. I don't think you ever get back to exactly the way you were, but you do get close. And I'm happy with that - especially when you see your kid for the first time."

Heidi is famous for springing back into shape quickly after giving birth - she wore a bikini for a Victoria's Secret fashion show just two months after welcoming three-year-old Henry into the world.

The 36-year-old model has also spoken about her love for her 6ft 3ins tall musician husband, explaining her family is the most important thing to her.

She told Page Six magazine: "What do I love about him? Aside from his sexy stature? He's a gentle giant. We're very into family values. If you come to our house in Los Angeles you'll see that it's not a big, museum-like house where you can't touch anything or sit anywhere. It's a family house, where three children are living. We have toys all over the place."