The song sung by Siddharth Mahadevan and Shilpa Rao is penned by Sameer Anjaan and composed by Pritam. The promo shows Aamir and Katrina perform some breathtaking aerial stunts, something the Indian movie goers might have never seen before in a film. The song is touted to be the most expensive song ever shot. The makers are believed to have invested a whopping Rs 5 crore for shooting the track! If the promo alone could be so spectacular, wonder what the song in entirety has in store for all of us.