Trisha Krishnan was born on May 4, 1983, in a Tamil Brahmin family, Chennai. She completed her schooling from Sacred Heart Matriculation School in Church Park and graduated in BBA from Ethiraj College, Chennai.
She began her career with modelling and subsequently appeared in several print advertisements and TV commercials. Trisha made her entry into the film industry after winning several beauty pageants including the 'Miss Salem' and 'Miss Madras’ in 1999. Later, she had also won Miss India 2001 pageant's "Beautiful Smile" award.
Trisha made her female solo debut with 2002 romantic-drama movie Mounam Pesiyadhe starring Suriya as the protagonist, which was written and directed by Ameer Sultan. This film was a moderate success at the box-office. The actress has been paired opposite some of the top South Indian superstars including Rajinikanth, Ajith, Prabhas, Thalapathy Vijay, Siddharth and Vikram.
On January 2015, Trisha got engaged to a Chennai-based businessman named Varun Manian. Sadly, the duo called off their engagement after four months, in May 2015. Earlier, she has reportedly dated Rana Daggubati for quite some time.