It’s Bollywood actress Katrina Kaif who’s singing for Dhoom 3, will now also be lending her voice for a romantic number, composed by AR Rahman in Yash Chopra’s directorial comeback, also starring SRK and Anushka Sharma, reports Mumbai Mirror. Katrina’s friend told the tabloid: “No half-measures for Katrina these days. She had earlier decided to sing for Yash Raj’s Dhoom 3 with about a week of rehearsals thrown in. But now, she has grown more ambitious and wants to try out a more complex singing challenge the other film directed by Yash Chopra has thrown at her.” Katrina Kaif has been associated with Rahman before. She recited nursery rhymes for a charity album composed by the music maestro. “Earlier, Kat had a persistent offer from Ali Zafar to sing with him for his private album. He was keen but she begged off.