March 06, 2012 04:30 PM

Jon Kopaloff/FilmMagic

A Leap Day baby!

Linda Cardellini and boyfriend Steve Rodriguez welcomed their first child, daughter Lilah-Rose, on Wednesday, Feb. 29, her rep confirms to PEOPLE exclusively.

“It’s a wonderful, thrilling event,” the Return star, 36, told PEOPLE in December.

“I think you can’t help but be slightly terrified because somebody’s whole life will be in your hands.”

The actress, who formerly starred on Freaks and Geeks, E.R. and in the Scooby-Doo films, announced her pregnancy in October.

— Sarah Michaud with reporting by Ulrica Wihlborg

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