Justin Timberlake confirms baby rumour with Instagram post

It was Justin Timberlake's birthday on January 31, but there was another birth date that was 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 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-winner married Jessica Biel in 2012. It will be the first child for both of them. Jessica's pregnancy has been rumoured for weeks, but Justin's post is the first official confirmation.