Grace, 37, called them an "amazing" couple and said he was thrilled that Kutcher and Kunis, who have 10-month-old daughter Wyatt Isabelle, recently tied the knot, reported Female First.
"They are both amazing people so the fact that they're together now and have a kid, it's like your two great friends from high school got together after high school."
Kutcher, 37, and Kunis, 32, first met on the set of comedy series, which ended in 2006, when the brunette beauty was just 14, but only started dating in April 2012 following his split from ex-wife Demi Moore.