Credit: Gareth Cattermole/Getty Images

Horrible Bosses star Charlie Day has some not-so-horrible news to share: he and wife Mary Elizabeth Ellis are expecting a baby!

"I'm excited," he told Us Weekly Saturday at the Cowboys and Aliens premiere in San Diego, Calif. "Who wouldn't be excited about being a daddy? Well, maybe a 16-year-old in high school wouldn't be excited, but a 35-year-old man like me is looking forward to something bigger than himself."

Due in December, this will be the first child for Ellis, 32, and Day (who both appear on FX's It's Always Sunny in Philadelphia). The couple wed on March 4, 2006.