The time just flew by!

How I Met Your Mother star Alyson Hannigan and her husband, actor Alexis Denisof, who kept the gender of their baby a secret during pregnancy, have welcomed a daughter.

The girl is named Satyana Denisof and was born March 24 in Los Angeles, which also happens to be Hannigan's birthday. "They're very excited, and mom and baby are doing great," says the rep.

This is the first child for Hannigan and Denisof, 42, who met on the set of Buffy the Vampire Slayer during the 1999-2000 season and were married at the Two Bunch Palms resort near Palm Springs, Calif., in 2003.

Can't wait for the baby pics. Congrats!