Larter Having Baby Boy

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September 10, 2010 | 3:00pm EST

Actress Ali Larter is expecting a baby boy when she gives birth this winter.

The Obsessed star and her husband, writer/actor Hayes MacArthur, announced Larter was expecting their first child in July, and the couple has kept the baby’s sex under wraps.

But Larter spilled the secret on comedian Jimmy Fallon’s U.S. late night show on Thursday, when the funnyman presented her with a pair of onesies – one pink and one blue.

Snatching the blue baby suit, she shouted the news and delivered a raunchy quip: “We’re having a baby boy! Yes, I have a little penis inside of me.”