Hilary Duff expecting a baby boy

Blue gum cigars for everyone!

While on "Ellen" (airing Monday), Hilary Duff broke the news that she and hubby Mike Comrie are expecting a baby boy!

After Ellen DeGeneres asked the starlet if she knew the sex of the child, Duff responded with, "I do, but I haven't told anyone yet. I wanted to tell you first."

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But that would've been too easy....

MORE: Happy Birthday to Baby Bumpin' Hilary Duff!

The host tried to guess the sex of the baby with a series of questions, first.

"Are you craving anything? ... I don't have a clue. I'm just going to guess boy." Sharp shooter, Ellen!

PHOTOS: Baby Bumpin'

"It's a boy! Good job. I had feeling it was a boy the whole time," Duff said.