She made her acting debut in the 2010 film Dabangg co-starring Salman Khan. The film went on to become one of the highest grossing Bollywood films. Salman had seen her at a function engaging in dancing and offered her the role. Speaking about it, she said that she had lost a weight of 30 kg over a period of two years in order to prepare for her character of a village girl by "a combination of proper diet and vigorous exercise". She also added that she had been "observing people and trying to pick up nuances" as a step of further preparation.She also featured as the cover girl of Indian edition of Maxim magazine for the month December 2010.
Although Sinha had no film release in 2011, she won quite a few awards for her debut. This included the Filmfare Award as well as the IIFA Awards among many others.