Credit: Donato Sardella/Wireimage.com

It's a boy for Diablo Cody!

The Oscar-winning Juno screenwriter, 32, and her husband Dan Maurio welcomed their first son Tuesday, she announced on Twitter.

"We had our boy early this morning! Marcello Daniel Maurio, 7lbs, 2 oz, lightly mustachioed," she wrote.

announced she was expecting on Twitter as well.

"Thanks for the congrats on my fetus," she wrote in April. "No secrets here. Just thought it would be fun to see how big I could get before someone noticed." See the top 10 gifts for moms.