Karthik Sivakumar, known professionally as Karthi, is an Indian actor who is known for his works in Tamil Cinema. The youngest son of veteran actor Sivakumar and the younger brother of actor Suriya, he began his career with roles in films such as an uncredited cameo role in Aayutha Ezhuthu (2004). He then achieved his breakthrough role in his debut film Paruthiveeran (2007). After a three-year hiatus from acting, he then return to star in films such as Aayirathil Orvuan, Paiyaa and Naan Mahaan Alla, all three of which were released in 2010. He then continued to star in films such as Siruthai (2011), Saguni (2012), Alex Pandian (2013), All In All Azhagu Raja (2013) and Biriyani (2013).