Karisma, 37, is making her Bollywood comeback after five years with the 3D venture.
"Saw the first half of 'Dangerous Ishhq' last night and have a confession to make... think I have a school boy crush on Karisma Kapoor!!," Bhatt posted on Twitter. The film, which revolves around a woman's search for her love through many lives, will hit screens on May 11.
Photos: Katrina Kaif, Shamita Shetty at Mumbai airport
Photos: Varun Dhawan, Alia Bhatt promote 'Badri...' on 'Dil Hai Hindustani'
In pictures: 15 facts about kissing that will surprise you
Photos: Shahid Kapoor and Mira Rajput at cafe in Bandra
Photos: Deepika Padukone, Neha Dhupia and Soha Ali Khan at event