"Changed my hair colour from my blondish look to a deep red colour! Quite a change! Can't recognize myself, " the 33-year-old shared the information on her micro-blogging site Twitter.
The actress, who is eagerly awaiting her forthcoming film "Jodi Breakers", in which she is paired with R. Madhavan, is also working on "Raaz 3" and the film is set for a July 6 release.
"Well guys today was dedicated for preparation for 'Raaz 3'! Shoot begins... anxious and excited! Very challenging role, totally different from the real me, " she wrote.
The movie also stars Emraan Hashmi and Jacqueline Fernandez.