Tanwar was born on 12 January 1973 to Rajendra Singh Tanwar, a retired CBI officer, in a middle-class family from Alwar, Rajasthan, India. She was educated in many Kendriya Vidyalayas before graduating from Lady Shri Ram College in New Delhi. Prior to this, in 1990, after completing her pre-university course, she worked as a sales trainee at a five-star hotel. In college, she was the secretary and President of the dramatic society. After graduation, while preparing for the entrance tests to the administrative services and mass communications, she gave an audition for the national broadcaster Doordarshan's film songs based program Albela Sur Mela in 1998; she was selected as the presenter.