Riteish, who tied the knot to Genelia two years ago, took to Twitter to share the news with his fans.
"It's a BBBOOOOYYYYYY!!!" the 35-year-old actor posted on his Twitter page.
The two stars were first romantically linked with each other when they starred in their Bollywood debut film 'Tujhe Meri Kasam' in 2003.
The two have also shared screen space in 'Masti' (2004), 'Tere Naal Love Ho Gaya' (2012) and recently released Marathi film 'Lai Bhaari'.