The excited father took to Twitter to share the good news and posted: "It's a BBBOOOOYYYYYY!!!!!!!!"
The couple, who had been dating since 2003, tied the knot in 2012. Having starred together in movies like Tujhe Meri Kasamand Tere Naal Love Ho Gaya, they are often called the 'cutest couple of tinsel town'.
A string of adorable photographs of the duo recently went viral -- they featured a heavily pregnant and glowing Genelia in some candid moments with Riteish, who is an actor-producer and son of the late former Maharashtra chief minister Vilasrao Deshmukh.
The couple's friends from the Hindi film industry sent out congratulatory messages, welcoming them to the parents' club of Bollywood. Here's what they had to say:
Abhishek Bachchan: Congratulations @Riteishd and @geneliad on the arrival of the greatest gift ever. Welcome to the parents club!!
Karan Johar: And humongous congratulations to @Riteishd and @geneliad on being proud parents to a baby boy!!!!! Love you lots!!!!!
Nikhil Dwivedi: @Riteishd congratulations buddy. What super news n he shares his b'day with me!
Milap Zaveri: Yayyyyyyy congrats to the sweetest loveliest couple I know @geneliad n @Riteishd on becoming parents of a baby boy! Woohoo!
Lara Dutta: Heartiest congratulations to my dearest @Riteishd and new mama @geneliad!! Welcome to the best time in ur life!!!
Bipasha Basu: @Riteishd and @geneliad! Woohoo! Daddy n mommy! Congrats! Lil baby boy! Wow!