'Grey's Anatomy' star Eric Dane and his wife, actress Rebecca Gayheart, welcomed a baby girl to the family last year--and Dane can't believe how much he loves his new little family.

"I don't know if there's any change more significant that a human being can make than that of a woman becoming a mother. There's no change more dramatic," the 38-year-old star told PEOPLE.

"You know, I'm a hundred times more attracted to her now and I love her exponentially more than I did before. It's just great to see her be a mother," he added.

Dane also is in love with his little girl, Billie Beatrice. "I like watching her laugh," he told the magazine. "Seeing this kid laugh when you put her on the swing, or slide down the slide with her, it's just ... She owns me."