By Laura Hertzfeld
Updated June 12, 2012 at 12:00 PM EDT

How I Met Your Mother star Alyson Hannigan and her husband Alexis Denisof welcomed their second child, Keeva Jane, on May 23, People reports. Hannigan tweeted a photo of the baby’s hand on Tuesday. Hannigan and Denisof met while filming Buffy the Vampire Slayer and have been married since 2003.