After Bollywood beauty Priyanka Chopra, who will soon release her first music album, actress Katrina Kaif will also charm us with her sweet voice, according to reports. Kat will lend her voice to a song in Yash Chopra's yet to be titled directorial comeback featuring Shah Rukh Khan and her in the lead roles, a source said. The song is reportedly written by Gulzar and composed by A R Rahman. A close friend of the actress said, "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". The friend added, "Earlier, Kat had a persistent offer from Ali Zafar to sing with him for his private album. He was keen but she begged off. Then came the chance to sing in Dhoom 3, which she liked. But now, the prospect of singing a dreamy romantic song for a Yash Raj film, written by Gulzar and composed by A R Rahman has caught her fancy."