The JLS singer, 27, revealed the fantastic news to his Twitter followers on Saturday (19 July) by posting a stunning photo of himself and heavily pregnant AJ.
While he simple tagged AJ in the picture alongside several kisses, she revealed a little more with the message: "@oritseofficial and our lil legend!!! Words cant describe how I feel and how excited I am xxx love u xx"
The couple, who won ITV1's Stepping Out in 2013, managed to keep her pregnancy quiet until the very last minute!
Marvin Humes, former JLS member alongside Oritsé, excitedly tweeted the happy news that the baby is currently on its way - eek!
He wrote: "Huge congrats to @Oritse and @AJAzari the Williams baby is on the way!!! Very excited for you both! Big love."
Marvin and his wife Rochelle have one-year-old daughter Alaia-Mai, so Oritsé and AJ will be having the second JLS baby.
JB Gill and his wife Chloe Tangney are also expecting their first baby together.
Huge congratulations to Oritsé and AJ on their fab news!
Do you think Oritsé Williams will make a good daddy? Tell us what you think in the comment box below - our favourite story every week wins £50!
See the celebrity couples who have welcomed babies in 2014 so far:
Copyright: Rex Features WENN/Matthew Taylor/Daniel Deme/Josiah True/Matthre Taylor/JoeGot an iPad or iPhone? Reveal Mag is specially designed to fit!