New York ? Britney Spears, who sang “I’m not a girl, not yet a woman,” is now a mother – and she’s “ecstatic” about it.

“We are ecstatic to announce the birth of our son! Everyone is happy, healthy and doing wonderful. Thank you for all your love and well wishes!!” Spears and her husband, Kevin Federline, said in a statement posted on the singer’s Web site.

The baby was born Wednesday by Caesarean section at the UCLA Medical Center in Santa Monica, Calif., with Federline by Spears’ side in the delivery room, Us Weekly magazine reported.

Spears’ Web site includes an option for fans to “Send Your Best Wishes” to the couple. The proclamation, “It’s a Boy!” sits beneath a photo of Spears and Federline kissing.

The baby is the first child for the 23-year-old pop star and Federline, 27, who has two children with ex-girlfriend Shar Jackson.