It took Raj Khosla's blockbuster Do Raaste (1969) starring the phenomenon Rajesh Khanna to finally make Mumtaz a full-fledged star. Oddly, it was just an inconsequential girlfriend role, but director Khosla, so good at picturizing songs, filmed four unforgettable songs on Mumtaz. The film made her hugely popular, and she acknowledged that even though she had a small role, it was still one of her favorite films. When earlier, she had played a small role as Rajendra Kumar's sister in Gehra Daag, now was elevated to playing his leading lady in Tangewala. Earlier, Shashi Kapoor had refused to work with her because she was a "stunt film heroine" in Saccha Jootha, now wanted her to be his heroine in Chor Machaye Shor.
Mumtaz had no problems acting sexy and due to her great looks, easily had several more hit films. She acted in over a hundred films in a career that spanned just 12 years. She won the Filmfare Best Actress Award for one of her favorite films Khilona in 1970, and she was "very happy that the audience accepted her in an emotional role.Mumtaz starred in many movies with Feroz Khan and her other popular pairing have been with Jeetendra and Rajesh Khanna. She has also acted with Dharmendra, Sanjeev Kumar and other top heroes of her era. She was proud of her work in her other favorite films Tere Mere Sapne for director Vijay Anand, as well as Roop Tera Mastana, Aap Ki Kasam, and Aaina.
She quit acting after her appearance in Aaina (1977) which was a flop, even though it had co-starred Rajesh Khanna and was directed by famous director K. Balachander.
She married millionaire Mayur Madhvani on May 29, 1974, they have two daughters: Natasha and Tanya. Her daughter Natasha recently married actor Fardeen Khan, the son of Feroz Khan, in a lavish ceremony, in December 2005.
In June 2008, she was honored for her "Achievement in Indian Cinema" by the International Indian Film Academy (IIFA) in Bangkok.