June 12, 2012 04:00 PM

Jon Kopaloff/Filmmagic

It’s a sister for Satyana!

Alyson Hannigan and Alexis Denisof welcomed a daughter, Keeva Jane Denisof, on Wednesday, May 23, her rep confirms to PEOPLE.

“They are all doing well,” the rep says.

The couple, who met on the set of Buffy the Vampire Slayer, announced the pregnancy in December.

While promoting American Reunion, Hannigan remarked that the size of her bump had people wondering if she was due sooner rather than later.

“The last couple of times I’ve been at stores people have been like, ‘Oh, you’re ready to pop, right?'” the actress, 38, said. “I’m like, ‘Actually, I have a couple more months.'”

Soon after confirming Keeva’s birth, How I Met Your Mother star Tweeted a sneak peek of her newborn — a photo of her little hand.

Alyson Hannigan

— Sarah Michaud with reporting by Julie Jordan

RELATED GALLERY: Alyson Hannigan’s Haute-to-Hip Pregnancy Style

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