Bachna Ae Haseeno (transl. Watch Out, Beauties) is a 2008 Indian Hindi-language romantic comedy film directed by Siddharth Anand and produced by Aditya Chopra under the Yash Raj Films banner. The film stars Ranbir Kapoor, Bipasha Basu, Deepika Padukone, and Minissha Lamba, and features supporting performances from Hiten Paintal and Kunal Kapoor. The title is taken from the 1977 song "Bachna Ae Haseeno" from Hum Kisise Kum Naheen, which stars Kapoor’s father, Rishi Kapoor. The narrative follows a commitment-phobic man who reflects on his past relationships and attempts to make amends with the women he once wronged.

The film marked Anand’s third directorial collaboration with Yash Raj Films, following Salaam Namaste (2005) and Ta Ra Rum Pum (2007). Principal photography took place across multiple international locations, including Switzerland, Italy, Australia, and India, with cinematography by Sunil Patel. The music was composed by Vishal–Shekhar, while lyrics were penned by Anvita Dutt Guptan.

Released theatrically on 15 August 2008, coinciding with India’s Independence Day, Bachna Ae Haseeno received mixed-to-positive reviews. Critics praised its soundtrack, styling, and visuals, with particular acclaim directed towards Basu’s performance. The film emerged a commercial success, grossing ₹61.57 crore (US$7.6 million) worldwide, making it the eighth highest-grossing Hindi film of the year.

At the 54th Filmfare Awards, the film received three nominations: Best Supporting Actress (Basu), Best Male Playback Singer (KK for "Khuda Jaane"), and Best Female Playback Singer (Shilpa Rao for "Khuda Jaane").

Raj Sharma is a young software designer who embarks on a journey of self-discovery after three pivotal romantic encounters shape his understanding of love and responsibility. The narrative unfolds through a series of flashbacks, beginning in the present day before moving into distinct phases of Raj's life.

Fresh out of school, Raj travels to Switzerland with friends, where he meets Mahi Pasricha, a romantic idealist from Amritsar who dreams of experiencing a love story akin to Dilwale Dulhania Le Jayenge (1995). After helping her catch a flight following a missed train, Raj shares a romantic moment with her, including a kiss and a heartfelt poem. However, Mahi later overhears him boasting to his friends about the encounter and learns he never wrote the poem. Devastated, she departs heartbroken, leaving Raj remorseful.

Raj, now a game developer in Mumbai, enters a live-in relationship with Radhika Kapoor, an aspiring model. When offered a job opportunity in Sydney, he is reluctant to take Radhika with him and cannot admit his fear of commitment. On the day of their scheduled wedding, Raj flees the country without informing her, leaving Radhika abandoned at the registrar’s office.

Now settled in Sydney, Raj meets Gayatri Jakhar, a confident and independent woman who juggles business school, supermarket shifts, and taxi driving. Unlike his past experiences, Raj finds himself genuinely falling in love. He proposes marriage, but Gayatri declines, expressing contentment with her independent lifestyle. Rejected for the first time, Raj reflects on his past behaviour and decides to seek forgiveness from both the women he hurt.