The 32-year-old pop star revealed his happy news on Instagram yesterday (18 September) by uploading a sonogram of their unborn child, as well as a couple of snaps of Thara glowing with her baby bump.
He captioned the candid pictures: "Well here it is! The new addition to the fam! As some of you may now know, me and the wifey @tharanatalie are expecting a Lil Sheezy ....or Sheezette!! Here's the first pic of the little one!! Thanks for all the love and well wishes on Twitter."
British born Jay Sean (real name Kamaljeet Singh Jhooti) is now based in America, where he has signed a lucrative music deal with Cash Money Records - the same label that is home to artists including Lil Wayne, Paris Hilton, Christina Milian and Busta Rhymes.
The successful singer has been extremely private about his personal life until now and has kept his marriage to model and songstress Thara mostly out of the spotlight.
The pair first met in 2007 when they collaborated on the song 'Murder' and they later hooked up again to record a track titled 'Love Goes'.
Thara also appeared in her hubby's music video for 'Stay' in 2008.
Congratulations to the expectant parents!
Check out which other celebs are expecting children this year in our gallery below.
Copyright: Vimeo / Weiss Eubanks