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Congratulations are in order for "American Pie" star Jason Biggs.

Biggs, 35, and wife Jenny Mollen revealed they're having a baby! The "Grassroots" star was the first to break the news in typical, witty Biggs fashion.

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While on "Chelsea Lately" last night, he joked about why his wife of five years had larger than usual breasts as of late.

"Would you like to know why?" he said. "Cause I put a baby in her belly!"

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Mollen followed up her husband's jokes with some of her own via Instagram, posting a pic of her many positive pregnancy tests with the line, "Decided I'm not releasing the name of the father."

Se also posted a picture of the sonogram.

Biggs and Mollen met while filming "My Best Friend's Girl" and were married in April 2008. This is their first child together.