Britney Spears and husband Kevin Federline have officially announced the birth of their first son together on the popstar's website.

The proud parents have expressed their happiness with a picture of them kissing against a backdrop of blue balloons and a heartfelt message thanking loyal fans for all their support.

Spears writes, "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 Federline welcomed PRESTON MICHAEL SPEARS FEDERLINE into the world yesterday afternoon (14SEP05) when the TOXIC singer underwent a Caesarian section at California's Santa Monica UCLA Medical Center.