Initially known as the son of Rakesh Nath, secretary of leading Bollywood stars, Karan earned recognition through his debut film 'Pagalpan' (2001). The film flopped but Karan's performance was appreciated and his looks and dancing abilities won the audience's attention. He also won the Best newcomer award for the film. Belonging to Hoshiarpur, Karan stepped into filmdom as a child artist in Mr. India (1987). He has starred in films like 'Yeh Dil Hai Aashiqana' (2002), J P Dutta's 'LoC Kargil' (2003), 'Sssshhh' (2003) etc. Apart from the fact that he has played in negative roles, he has also been in the news for his steamy scenes in the film 'Tum—a dangerous obsession' (2004) opposite  Manisha Koirala and Netanya Singh. The handsome hunk with his well-toned physique was once a National Level Tennis player.