Heidi Klum Doesn't Know Sex of Baby No. 4 – Yet

Heidi Klum Doesn't Know Sex of Baby No. 4 – Yet
Heidi Klum (left) and Ellen DeGeneres
Michael Rozman/Warner Bros.

05/01/2009 AT 08:40 AM EDT

With Baby No. 4 due to arrive this fall, Heidi Klum got a gentle ribbing from Ellen DeGeneres, "because," the show host tells the supermodel on Monday's upcoming The Ellen DeGeneres Show, "you have already six or seven, don't you?"

"No, we have three," replies the Project Runway host, 35, referring to husband Seal, 46. Their brood consists of daughter Leni, 4 (whose dad is Italian businessman Flavio Briatore), and sons Henry Günther, 3, and Johan Riley, 2.

"Well, a lot," says DeGeneres.

As for adding to the family, Klum says, "We weren't planning, but we also weren't not planning, either. We were kind of leaving it open. We were always looking around the table and always thought one more would be nice."

The supermodel also admits to some method to her maternity. "We kind of took one baby at a time, and every time we thought, 'Yeah, one more, that's it' … But I think now it's the first time I feel like this is it."

Asking the big question, DeGeneres says, "You have one girl and two boys. And so do you know what it is – a boy or a girl?'

After guessing her guest is going to have a girl, DeGeneres then asks Klum, "Are you going to find out?"

"Yes," says Klum, "probably at the end of the month."

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