The 19-year-old will make her Bollywood debut in Karan Johar's Student of the Year.
She told IANS: "I have always loved Ranbir and I love him even more after Barfi! He is my biggest crush and he will always remain my biggest crush."
Bhatt recently admitted that she did not plan to go into acting after leaving school.
She claimed in August that she had decided against starting out in a film produced by her father Mahesh.
Mahesh Bhatt famously produced The Dirty Picture, Jism and Murder 2.
She said: "Honestly speaking, it's the easy option. Why wouldn't my father launch me? But I wanted to go somewhere else.
"I had to audition for Student of the Year, I had to lose weight and present myself in a way that I can be accepted."
Student of the Year will be released on October 19.
Watch the trailer for Student of the Year below: