Jan 31, 8:40 PM EST

Justin Timberlake celebrates his 34th birthday with confirmation of baby news

AP Photo
AP Photo/Evan Agostini
Buy AP Photo Reprints

NEW YORK (AP) -- It's Justin Timberlake's birthday, but it's another birth date that's on his mind - that of his future son or daughter.

The superstar shared a picture of a bulging belly - presumably belonging to wife Jessica Biel - on Instagram on Saturday, his 34th birthday. He wrote that he was getting the greatest gift ever this year and added: "CAN'T WAIT."

The sex of the baby is not yet known; the actor-singer joked that the couple is taking bets.

The Grammy-winning Timberlake married Biel in 2012. It will be the first child for both. Biel's pregnancy has been rumored for weeks but Timberlake's post is the first official confirmation.

© 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed. Learn more about our Privacy Policy and Terms of Use.