The 29-year-old star, who is currently in Lucknow for the film's shoot, shared the news on Instagram by thanking director-producer Tony D'Souza for giving him a chance once again.
"'Behen Hogi Teri'. ThanksTonyDsouza. God Bless You for always being there for me," he wrote.
Gulati and D'souza has previously worked in "Azhar", where the actor played former Indian cricketer Ravi Shastri.
Amul Vikas Mohan, one of the producers of "Behen Hogi Teri", also welcomed Gulati to the cast by tweeting, "Lucknow waalon... Apni girlfriends sambhaalo @TheGautamGulati sheher mein aa chukein hain...