Credit: Jon Kopaloff/FilmMagic

Break out the pink balloons!

Freaks and Geeks actress Linda Cardellini and her boyfriend Steve Rodriguez welcomed their first child, a daughter named Lilah-Rose, on February 29, her rep confirms to Us Weekly.

Also known for her roles on ER and as Velma in the Scooby-Doo film franchise, Cardellini, 36, confirmed her pregnancy in October 2011.

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Dealing with a nasty bout of morning sickness for the first four months of her pregnancy, the actress has called impending motherhood a "miracle."

"It's amazing and I can feel kicking and it's a totally unbelievable experience," she told Access Hollywood last December. "It's a little bit like Alien in science fiction and then also it's a crazy miracle."