Bollywood actor, director and producer Aamir Khan turned 51 on Monday. Born as Mohammed Aamir Hussain Khan, he first appeared on screen as a child actor in the film 'Yaadon Ki Baaraat' (1973). Khan, a recipient of four National Film Awards, was also honoured with the Padma Shri in 2003 and the Padma Bhushan in 2010.