Jason Schwartzman is to become a father.

The 'Scott Pilgrim vs. the World' star and his wife Brady Cunningham have announced they are expecting their first child together.

And Jason has decided to grow a moustache in preparation for his new arrival so he can embarrass his child in years to come.

He told US talk show host Jimmy Kimmel: "I'm expecting a child in December. I decided to grow out this moustache, so when we take photos, my boy or girl, whatever it is, they will be embarrassed.

"So I am now thinking of ways to embarrass my unborn child."

The 30-year-old actor has been inspired in his quest to embarrass his child by his own father composer David Shire's sizeable moustache.

Speaking about his baby photos, he explained: "I would show my friends, 'Look at my father's moustache, how terrible is that?!' "

Jason - whose mother is 'Rocky' star Talia Shire - and fashion designer Brady married in a low-key ceremony at their San Fernando Valley home in July 2009.