Singer Justin Timberlake has said his wife Jessica Biel and he are expecting their first child together.

Timberlake announced the happy tidings by posting a photograph on his Instagram page on his 34th birthday Saturday, reports hollywoodreporter.com.

In the photograph, the 34-year-old is seen kissing the actress' baby bump.

Alongside it, he wrote: `Thank you EVERYONE for the Bday wishes! This year, I'm getting the GREATEST GIFT EVER. CAN'T WAIT. #BoyOrGirl #YouNeverKnow #WeDontEvenKnow #WeAreTakingBets.`

Rumours about the pregnancy began circulating last November, but the couple, who married in 2012, had so far remained tight lipped about it.

However, a month later singer Joey Fatone confirmed the news while talking to In Touch magazine.