Rachael Leigh Cook, Daniel Gillies welcome baby girl

Rachael Leigh Cook and Daniel Gillies are now parents to a baby girl.

The baby is the "She's All That" actress' and the "The Vampire Diaries" actor's first child, born Saturday. The couple has been married since Aug. 14, 2004.

Gillies tweeted shortly after her birth.

it's a girl.

the tiny new empress of my everything. she's immaculate. we're delirious.

— DANIEL GILLIES (@danieljgillies) September 29, 2013

Details beyond the tweet were few and far between, but rumors spread Friday that they had had their baby.

beautiful people: baby has not arrived. yet. please disregard the gossip+misinformation. we'll keep you posted. Xx love d+r+?

— DANIEL GILLIES (@danieljgillies) September 28, 2013

The two announced Cook, 37, was expecting last May. Gillies joked about the baby's name, naturally -- but until her name is released, she'll be stuck being known as "Keanu Robocop."

"A lot of people are asking whether I'd prefer a boy or a girl. In truth, it doesn't matter to me — I just can't wait to meet little Keanu Robocop," he said.