Reason why Alia Bhatt is the hit machine of Bollywood

She played a student in her debut film Student of The Year; in her second film Highway she played a kidnapped rich girl; Alia played an IIM pass-out in 2 States. With every roles she seems to be growing and ow she plays Varun Dhawan's bride in Humpty Sharma Ki Dulhania. Everyone expects even this film to be a hit as she has given consecutive blockbusters in a row. Here is why she could be the next big thing in Bollywood.