@alydenisof/Twitter 1 / 19
@alydenisof/Twitter 1 / 19

That's one adorable little hand!

Alyson Hannigan and Alexis Denisof welcomed the birth of their second daughter, Keeva Jane Denisof, on May 23.

PHOTOS: Pregnant stars who've bared it all

Hannigan's rep first confirmed the news to Us Weekly exclusively on Tuesday, adding, "They are all doing well."

PHOTOS: Incredible post-baby bodies

Shortly after that happy announcement, Hannigan took to her Twitter account to share the first photo of her new baby girl -- but only a glimpse. Hannigan posted an Instagram of Keeva's tiny hand with the caption, "Love." 

Keeva joins big sister Satyana, 3. Hannigan, 38, and Denisof, 46, married in October 2003.

PHOTOS: Alyson and adorable Satyana

"[Being a mother] has changed me in every way because my life is so much greater," she told Us in May 2010. "It filled a void I never knew was there -- it's the most amazing experience of my life. I just feel so blessed to get to be on this journey, to be a mommy. [Satyana] is just the greatest baby."

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