She then played Vikram’s lady love in the mega blockbuster Saamy. The next huge film she took part in followed immediately afterwards, was Ghilli with Vijay, which was a remake of Telugu blockbuster Okkadu.

In 2004, she starred in Varsham in Telugu which went on to become the biggest hit of the year and turned her into an overnight sensation. In 2005, she starred alongside Siddharth Narayan in the telugu flick Nuvvostanante Nenoddantana as the village girl Siri. The movie is about a rich boy, who tries to marry a girl – however her brother opposes. It is directed by Prabhu Deva, was successful at the box office[1] Krishnan won 2 awards for the film which include the Filmfare Award and Nandi Award.

She appeared in Mani Ratnam’s Aayitha Ezhuthu which was remade into a hit Hindi movie Yuva. The Tamil version included Siddharth Narayan, Madhavan and Surya. Her later movies, Ji, Aathi and Aaru did not do well – though Aaru was received well by critics and both dubbed in Tamil and Telugu and produced by Saran, who had previously directed several successful movies.[2] Her 2006 Telugu movie, Pournami, directed by Prabhu Deva, was a flop. However, another 2006 film, Something Something … Unnakum Ennakum, where Krishnan acted opposite Jayam Ravi, did well at the box office. Something Something … Unnakum Ennakum is a remake of the Telugu movie, Nuvvostanante Nenoddantana where she plays the same role.

Her Telugu film Sainikudu with Mahesh Babu was released on November 30, 2006. There were high expectations in the trade circles from this film especially after the smashing hit Pokiri, but this high budget film started off with below average reviews. Despite receiving bad reviews from the film trade, the film managed to get a fantastic opening in India and overseas. The movie did very well abroad.

Her next release after Sainikudu was Aadavari Matalaku Ardhalu Verule where she was cast opposite Venkatesh. This film was Selvaraghavan’s first film in Telugu. The film released on April 27, 2007. The film is a family entertainer and received good response especially from the family audience. The box office returns exceeded the collections of later releases like Aata and Munna. Krishnan’s performance is one of the highlights of the movie.

In Kireedam with Ajith, Krishnan tried comedy and received rave reviews. Kireedom opened with high expectations and received good reviews from media and audience. Her 2008 film, Krishna with Ravi Teja, directed by V. V. Vinayak, opened to rave reviews.

Her other projects include four Tamil films, Bheema with Vikram, Radhamohan’s Abhiyum Naanum, Kuruvi the Vijay-Dharani project and a Gautham Menon film. She has also signed a Telugu film: Bujjigadu starring Prabhas, directed by Puri Jagannadh.

Trisha recently replaced Rani Mukherjee as the Brand Ambassador of Fanta India. She is the brand ambassador of Scooty Pep+, for which she has replaced Preity Zinta. She endorses Perk chocolate, for which also she has replaced Preity Zinta.

Having penned the story, screenplay and dialogues, Kamal said that working on the screenplay was the toughest part, as the subject itself was very complex. This out of the ordinary story line should be another reason to draw the crowds to the theaters.