After completing MBA Siddarth assisted Mani Ratanam's kannthil Muthamittal he worked with Mani Ratnam and début Tamil movie Boys for which he has won IFTA Best Actor Award after that he worked in many movie like Aayutha Ezhuthu, Rang De Basanti for this he has won Star Screen Best Debut and nominated for Filmfare Award. His recent released bollywoood movie is Striker and coming up with many other movies also.
Siddarth married with his friend in the year 2003 but because of some personal problem couple got separate.