"Do you have twins in there?" Billy asked Heidi.
"No, not that I know of," she said.
"That would be five kids," Billy continued. "That would be too much, right?"
"I kinda have five children," Heidi joked, referring to husband Seal.
"Are you done after this?" Billy asked the former supermodel.
"Yes, I think so," Heidi said.
Heidi also revealed that she and Seal still do not know the sex of the baby, who will join Leni, 4 – who Heidi had with Italian businessman Flavio Briatore – and sons Henry Günther, 3, and Johan Riley, 2.
Related Content from AccessHollywood.com:
PLAY IT NOW: Access Extended: Heidi Klum Talks Family Life (April 29, 2009)
PLAY IT NOW: Will Heidi Klum Reveal Her Baby's Sex? (April 29, 2009)