Heidi, who already has a daughter Leni, 5, with former lover Flavio Briatore, revealed that her daughter is keen to have a little baby sister.
"We'd be happy with either, but it would be a lie if I said we weren't all hoping for a little girl," Contactmusic quoted Heidi, as telling Us Weekly.
"Especially Leni, because she would love to have a little sister.
"She'll say, 'I hope it's a girl so she can be in my room, and I'm going to help you and I'm going to change the diapers and I'm going to be a really good sister," Heidi added. (ANI)