'Who is the hero, who is the hero...' is a popular song in Kamal Haasan's last venture 'Manmadhan Ambu'. Looks like it's now time for the actor to sing 'who is the heroine' for his forthcoming film, 'Viswaroopam', as there are some problems reportedly on in this front.

Bollywood girl Sonakshi Sinha, who was roped in as the heroine for 'Viswaroopam', has walked out of the project due to problems in allotting dates, say sources close to the unit. "Sonakshi initially allotted bulk dates for 'Viswaroopam'. Since the project is getting delayed, the 'Dabangg' girl finds it difficult to issue fresh dates, since she has a couple of commitments in Bollywood," they add.

Meanwhile, there is a rumour in Kollywood, that Deepika Padukone is being considered for 'Viswaroopam'. Remember the Bollywood bombshell is already the heroine of 'Rana', which has Kamal's good friend Rajinikanth in the lead.