She was brought to light by Malayalam director Fazil, who had seen Saranya dancing at her dancing school.[3] After approaching and persuading her parents, he casted her for a child character in the 1997 Malayalam film Aniyathi Pravu and its Tamil remake, Kadhalukku Mariyadhai. Following two more roles as a child artiste, she took a break, concentrating on her studies,[4] before enacting a supporting role in another Fazil directorial, Oru Naal Oru Kanavu (2005), in which she acted as a sister to the male lead character. Her subsequent release, the Dhanush-Nayantara starrer Yaaradi Nee Mohini (2008), brought her into limelight. Her comedic performance as the younger sister to the lead female, who has a crush on her sister's love interest, won her fame and many accolades. She subsequently appeared in a number of Tamil films, which, however, were less successful. 2009, she had six releases, four of which being Tamil projects. Out of her Tamil releases, the tragedy sports film, Vennila Kabadi Kuzhu, directed by debutante Suseenthiran, and the supernatural thriller Eeram proved to be commercially as well as critically successful. Later that year, she made her Telugu debut with Village Lo Vinayakudu and made her comeback to Malayalam films, starring in Chemistry. In 2011 she acted in M.Raja's Velayudham which turned out to be a huge hit. Her role as Vijay's sister won her a lot of good reviews. She also acted in another film named Dharani's Osthi in 2011.
source: http://en.wikipedia.org/wiki/Saranya_Mohan