Rani Mukherjee might have fewer offers as main lead heroine but that did not sublime her career. She is taking it more seriously now. After the raunchy dance number Dreamum Wakeupum and a lavani in the song Sava Dollar, Rani Mukerji has gone a step further in her upcoming film Aiyyaa. The actress has done some sensual belly dancing moves in the latest track, Aga Bai, in the film.Rani trained herself in belly dancing to lend authenticity to the number. She had relentlessly trained for four months for the song.