Arjun made the announced with an adorable post on social media.
"Blessed to have you and start all over again....thank you baby for this baby 👶🏽," Arjun captioned a love-filled picture of himself and Gabriella, in which she can be seen dressed in a gown, sporting her pregnancy bump.
Gabriella also posted the same photo on her Instagram account, saying, "Grateful for you too. Can't wait to meet you."
This will be the actor's third child. Arjun was earlier married to Mehr Jesia from 1998 to 2018 and the duo has two daughters together - Mahikaa and Myra.
Gabriella, a South African model, and actor, made her Bollywood debut with 'Sonali Cable' in 2014.
Arjun has starred in films such as 'Rock On!!', 'Ra. One', 'Housefull', 'Om Shanti Om', among others.
On the work front, Arjun was last seen in 'The Final Call', a web series.