Credit: John Russo

Meet Ali Larter's little hero!

The Heroes alum introduces her adorable son Theodore Hayes MacArthur exclusively in the new issue of Us Weekly, out now.

Born December 20 in Los Angeles, the actress' first child with hubby Hayes MacArthur weighed 7 pounds, 3 ounces at the time of his birth.

Given that both of his parents are actors, it's fitting that Teddy's arrival was a bit dramatic. "During the L.A. mud slides, our street was closed," Larter, 34, tells Us of the day she welcomed her son. "Four hours after the fireman opened it, I was in labor!"

Since then, Larter and her husband, 33 -- who currently stars on NBC's Perfect Couples -- say life has been less chaotic.

"It's incredible to look at this little guy and think he grew inside of me," Larter tells Us.

For more photos details about baby Teddy -- including Larter's favorite part of being a mom -- pick up the new issue of Us Weekly, on sale now.