Ranbir, Priyanka at Nita Ambani's 50th birthday bash (see pics)

Jodhpur: Oscar-winning music composer A R Rahman is all set to perform at the 50th birthday celebration of Indian business tycoon Mukesh Ambani's wife, Nita Ambani.Bollywood biggies like Ranbir Kapoor, Priyanka Chopra, Aamir Khan, Anil