Jeffrey Dean Morgan gets along famously with girlfriend Mary-Louise Parker's son

By Jeffrey Slonim
March 26, 2007 08:00 AM

When Grey’s Anatomy hunk Jeffrey Dean Morgan hooked up with his Weeds costar Mary-Louise Parker, he also got a new man in his life: Parker’s young son, William.

“We get along like peas in a pod,” Morgan, 40, told PEOPLE about the 3-year-old when he and Parker, 43, attended Thursday’s Broadway opening of the new musical Curtains. (William’s father is Parker’s ex, Billy Crudup.)

Asked how William was doing, Parker replied, “Fantastic.” But on the subject of how well her two guys get along, Parker – who earlier this month told PEOPLE that her relationship with Morgan is “going great” – demurred to her date. “You’ll have to ask him for yourself,” she said.

“He’s wonderful,” replied Morgan. “He’s great. We spend a lot of time reading, actually. And I just got back from the park [with him] before we came here.”

Being around a child, Morgan admits, “It’s a whole new world, a different world, but it’s fantastic. It’s great!”