Siddharth was born to a Tamil-speaking family in Chennai, India. He worked on the film throughout 2001, also making an uncredited appearance as a passenger on a bus. The script writer of that film, Sujatha, was insistent that Siddharth audition for Shankar's ongoing project Boys (2003). Siddharth then ventured into Telugu films by signing on to appear in Prabhu Deva's first directorial project, the romantic drama Nuvvostanante Nenoddantana (2005). The success of Nuvvostanante Nenoddantana saw Siddharth shift base to Hyderabad and pursue a career primarily in Telugu films, and was non-committal about taking up films in other languages. he later agreed to work on the film Rang De Basanti (2006) after being impressed after reading the film's bound script. Siddharth married Meghna on 3 November 2003, after the pair had fallen in love growing up in the same neighbourhood in New Delhi. However, by early 2006, the pair were living separately, and subsequently secured a divorce in January 2007.