Ranbir and Katrina are making waves once again. We hear the duo will now be seen in Imtiaz Ali's much awaited project Rock Star. The film was conceived a long time back and has seen much shuffling in the cast, from John Abraham to Saif Ali Khan, who was seen in Imtiaz's Love Aaj Kal.

But now, Ali has zeroed down on the cast. Ranbir will play a rock star and Katrina his ladylove. Ranbir would also have to learn to play the guitar for his role. The songs for the film would be composed by Pritam and not AR Rahman.

According to sources Ranbir is very excited about playing rock star. "Who wouldn't be ? It's a dream role," he told his friend. Attempts are on to sign Katrina for the only other film Ranbir has signed for 2010, which is being directed by Anurag Basu.