Kapoor rose to prominence with his performances in the coming-of-age film Wake Up Sid (2009), the romantic comedy Ajab Prem Ki Ghazab Kahani (2009), and the comedy drama Rocket Singh: Salesman of the Year (2009).The romantic drama Rockstar (2011) and the comedy drama Barfi!Kapoor has been vocal about how his parent's troubled marriage affected him as a child: "Sometimes the fights would get really bad.I would be sitting on the steps, my head between my knees, till five or six in the morning, waiting for them to stop".Fans of ex-lovers Ranbir Kapoor and Deepika Padukone were delighted on hearing that the duo will be reuniting post their last outing Tamasha.Ranbir and Deepika were supposed to walk the ramp together for ace designer Manish Malhotra at the Mijwan Fashion Show on April 9 this year. Before you jump the gun and draw your own conclusions, let us inform you that that duo won't be walking the runway together on April 9, that doesn't mean that Ranbir and Deepika won't walk the ramp together at all. the #fabulous #dapper #Charming #Ranbir Kapoor with the very #beautiful #stunning @deepikapadukone ...
In preparation, Kapoor observed the work of actors Roberto Benigni, Charlie Chaplin, and his grandfather.
The film was his first commercial success, in which his role was that of a womaniser who is romantically involved with three women, played by Bipasha Basu, Minissha Lamba, and Deepika Padukone, at different stages of his life. In Dharma Productions's Wake Up Sid, a coming of age film from director Ayan Mukerji, Kapoor portrayed Siddharth "Sid" Mehra, a rich, lazy teenager whose life undergoes a series of changes after interacting with an ambitious journalist (played by Konkana Sen Sharma).
When Mukerji narrated the then-untitled script of the film to him, Kapoor came up with the title himself.
Kapoor described it as his first complex role and considered it a departure from the "lover boy roles" that he had previously played.
Nikhat Kazmi of The Times of India reviewed: "The film finally belongs to Ranbir Kapoor who perfects the art of minimalism—and literally grows before your eyes—as the simmering volcano that cannot be held back, once it erupts." Robert Abele of the Los Angeles Times, however, was more critical of his performance which he considered "stony rather than calculating—especially jarring compared to the histrionic turns around him".