08/06/2009 at 03:00 PM EDT
It's no joke: Funnyman Bill Hader's wife is pregnant with the couple's first child.
At Gen Art's New York Premiere of Paper Heart Wednesday night, the Saturday Night Live star proudly showed off wife Maggie Carey's burgeoning baby bump.
"I'm really excited," Hader told PEOPLE of becoming a first-time dad. "I think it's going to be awesome."
Hader joins the ranks of other SNL parents – Amy Poehler and Maya Rudolph among them – but says he'll be the only current cast member with a child come fall. "So everybody will have to understand when I'm really tired," he joked. "Kidding – I'm actually handling it well."
As for mom-to-be Carey, Hader says she's been "great" throughout her pregnancy. "She's awesome," he shared. "Way tougher than I am."
Though the couple doesn't know the sex of their child, Carey does know one thing for sure: "Bill's going to be a really cute dad!"
The couple, who married in 2006, expect their new arrival at the end of September.
Reporting by JEFFREY SLONIM