updated 07/23/2011 AT 6:10 PM ET
•originally published 07/23/2011 AT 6:45 PM ET
It’s been a good year for comedian Charlie Day. His film Horrible Bosses is a hit at the box office, and he’s going to be a dad.
“We’ve got a kid due in December,” Day, 35, confirmed to PEOPLE at a Maxim and FX party at San Diego Comic-Con Friday night. “We’re five months along, and she’s feeling great. We’re excited.”
Day and his wife Mary Elizabeth Ellis, 32, who stars alongside the actor as “The Waitress” on It’s Always Sunny in Philadelphia, consciously decided to expand their family, says the comedian.
“We decided now is the time, and we were fortunate that it happened,” he says.