Kumar made his Bollywood debut with the romantic comedy film Ramaiya Vastavaiya, opposite Shruti Haasan, which was released on 19 July 2013.

In order to build the physique required for the film, Kumar had to undergo a strict regimen of training and diet for three years.

[4] Taran Adarsh of Bollywood Hungama commented on his performance: "Girish being a first-timer, there are some rough edges, but the fact is, he's photogenic and goes through the rigmarole with confidence.

"[5] Sarit Ray of Hindustan Times gave a less favourable review of his portrayal, saying "His dancing, unfortunately is only slightly less stiff than his acting."

[citation needed] In 2016, Girish played Gaurav in Loveshhuda, a romantic comedy opposite Navneet Kaur Dhillon.