Last week, Cuoco chatted with PEOPLE at the Rock4EB event in Malibu, California, where she discussed Pelphrey’s role as a first-time father.

“I cannot believe how natural he is, how much he loves it,” Cuoco said.

“I mean, when we were in the hospital, he did everything — every diaper, he’s the swaddle king,” she continued. “All the nurses said, ‘Oh my God, you’re the best guy swaddler we’ve ever seen.’ “

Noting that Pelphrey “just loves” Matilda, Cuoco added, “She looks exactly like him. And he has a very distinct voice, so when he talks to her, she’s like 360. Her head turns around, and she’s like, ‘I know that voice.’ It’s very sweet.”