Hayes MacArthur and Ali Larter

Ali Larter has given birth to a baby boy, her rep tells TVGuide.com.

The former Heroes star and her husband, Hayes MacArthur, welcomed Theodore Hayes MacArthur early Monday morning in Los Angeles.

Ali Larter is having a boy: I've got a little penis inside of me

"He's our perfect Christmas present," the new parents said of their firstborn.

Larter, 34, and MacArthur wed in August 2009 after seven years together. She announced her pregnancy in July and two months later memorably revealed the gender of her baby on Late Night with Jimmy Fallon.

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"I've got a little penis inside of me," she said on the show.

"That's what she said," Fallon joked.