The 41-year-old actor shares Charlotte, three, and Theodore, two, with wife Rachael Leigh Cook. The couple tied the knot in 2004.
In an interview with Entertainment Tonight, Gillies opens up about his kids, his "beautiful" wife and his family plans.
"This is going to sound like the creepiest thing of all time but when I was first married her, I remember just watching her sleep and thinking that is the most beautiful person and I would just watch her for a while.
When asked if there is any plan to expand their family, he says, "No! Daddy is going to pay a special visit to a special surgeon real soon. I'm too old as it is.
"My wife has got the energy of a 21-year-old and is physically in great condition, but me, I have, like, no knees and no shoulders. But no, that's the answer. I want to be able to give these two my love and my attention and my care.