Suri already is a little sister to Connor, 12, and Isabella, 14, Tom's two children from his marriage to actress Nicole Kidman. According to Katie, the three Cruise children get along famously.
The kids are so sweet, they're so great with Suri and she lights up when she sees them. We have so many kids in our house, there's always this wonderful chatter and the great noise of kids.
Katie said she had no qualms about Tom's ability to parent a baby, calling him a "great father."
It came as no shock that when we had Suri he was amazing with the baby.
The full interview will air Monday on Entertainment Tonight.