Heidi Klum Says Her Thighs And Butt Have Exploded During Her Last Month Of Pregnancy

Heidi Klum -- who is due in October with her fourth child, a girl -- says the last month of pregnancy is the worst.

"The last month is unbelievable, how rapidly your stomach goes. It's huge," Klum, 36, tells Page Six magazine (out Sept. 10). "The thighs, the butt -- everything explodes in the end."

Klum -- who famously sported a bikini at the 2005 Victoria's Secret fashion show just two months after giving birth to son Henry -- says she'll regain her pre-baby bod.

"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," she says. "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."

Klum also opens up about what makes her husband, Seal, "the one." The two celebrated their fourth wedding anniversary in May by renewing their vows with a "white trash" celebration in Malibu.

"Aside from his sexy stature? He's a gentle giant," she says of the Grammy winner, 46, who is six-foot-three. "We're very into family values. If you come to our house in L.A., 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 [Leni, Henry, 4; and Johann, 3] are living. We have toys all over the place."