Rachael Leigh Cook and Daniel Gillies: Having a Son Is ‘So Different’

People

Rachael Leigh Cook and Daniel Gillies may be all that when it comes to taking care of a little girl, but they’re just starting to explore life with a baby boy.

“You think the experience is going to be identical, but it’s just not,” Gillies, 39, told PEOPLE of their 11-week-old son Theodore Vigo Sullivan while attending the premiere of Max on Tuesday in Los Angeles. “It’s so different, and I’m not just talking about the gender thing.”