A journalist reports on the life of Mahi Arora (Kareena Kapoor), a renowned actress and film heroine, describing her as unstable and problematic, but damaged and lonely due to childhood trauma, and bipolar disorder. Through a flashback, we are shown Mahi's relationship with leading actor, Aryan (Arjun Rampal). Aryan is going through a divorce with his wife whilst dating Mahi. The couple makes a sex tape of themselves. When Mahi comes to know about an intimate scene Aryan is shooting for a movie, she creates a scene on the set, which upsets Aryan. The couple reconciles but Mahi is repeatedly insulted by Aryan's wife. While driving back from a party with Aryan, she raises the topic of his wife, which results in her being thrown out of the car. Realising her place in Aryan's life, Mahi goes into depression, putting her career in decline. A friend convinces Mahi to leave the past behind her and re-enter the industry so Mahi decides to r ejuvenate her career. She employs a public relations manager, Pallavi (Divya Dutta), who uses sensationalist tactics to reinvent Mahi's image. Mahi starts a relationship with the Vice Captain of the Indian National Cricket team, Angad Paul (Randeep Hooda). Soon, her personal and professional life is stable once again. On the advice of Pallavi, she uses Angad's connections to get a role in a big budget film. The lead actor of the film, Abbas Khan, a married playboy, attempts to initiate an affair with her. She rejects him, which causes him to seek revenge. He demands that the director re-edit the movie so that story becomes about him and an item girl. Mahi is dissatisfied despite the film being a success, and in a desperate attempt to prove her acting skills, works in a low-budget art film for months. Angad proposes to her but she feels that they should concentrate on their careers. This causes their relationship to end. The art film never completes, and Mahi goes into depres sion again. She is also denied the opportunity to adopt a child, due to her history of alcoholism and psychiatric problems. Since she cannot get a role in big-budget productions, she decides to work on a low-budget film with newcomers. Mahi meets Aryan at a wedding, and he apologises. The two rekindle their relationship. Aryan says that he wants her to do a big budget film with him but the director is reluctant to cast her as she has lost her appeal. Mahi becomes obsessed with the thought of losing the role to another heroine. At a poorly-attended press conference for an upcoming film, Mahi is mocked by journalists who inform her that the director has cast another actress opposite Aryan. Distraught, Mahi and Pallavi decide to create controversy by leaking the sex tape of her and Aryan. The video becomes a viral sensation and as a result, the low-budget film becomes an instant hit. Mahi's success is short-lived. She starts questioning her career and life choices. She finally deci des to leave the industry after her agent Rashid Bhai, a father figure to her, quits, and Shagufta Rizvi (Helen), a veteran actress she respected and admired, dies. At the end, Mahi is shown walking alone in a foreign country, and on being asked if she is Mahi Arora, she replies she is not.