Aishwarya Rai Bachchan plays a challenging role in Mani Ratnam's 'Raavan' as modern-age Sita. She has proved her talent of an ideal actor - acting for both Hindi and Tamil version. She plays the character Ragini who is a classical dancer and marries police officer Dev Pratap Sharma (played by South star Vikram). The gorgeous lady revealed that this has been one of the most challenging and unforgettable roles of her career and is positive that it will be received well by the audience.