Credit: Chelsea Lauren/WireImage.com

Baby on board!

It's Always Sunny in Philadelphia star Glenn Howerton and his wife, Jill Latiano, are expecting their first child. "Check out my beautiful preggers wife, y'all," the 35-year-old actor tweeted Sunday.

Howerton's Sunny in Philadelphia costars, Charlie Day and Mary Elizabeth Ellis, also have a little one on the way. Earlier this month, Day told Us Weekly: "I'm excited! 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 myself."