Dev was directed by Guru Dutt in the crime thriller, Baazi (1951). The film starred Dev Anand, Geeta Bali and Kalpana Kartik and became a cult classic, a trendsetter of urban crime films that followed in Bollywood in the 1950s.
Mona Singh was given the screen name of Kalpana Kartik by Dev Anand's eldest brother Chetan Anand.
Her pairing with Dev was a big success at the box office and they were offered many films together. They signed all the offers and starred in Aandhiyan (1952), Taxi Driver (1954), House No. 44 (1954), and Nau Do Gyarah (1957), all of which went on to become big hits.
During the making of Taxi Driver, the couple fell in love and Dev proposed marriage to Kalpana. They married in a secret ceremony in 1954 and the couple have two children —a son, Suneil and a daughter Devina.
After her marriage, Kalpana Kartik decided not to pursue her acting career.