Mumbai: Aamir Khan has been spotted on the streets of Chicago in his bike gear zooming around for the shoot of 'Dhoom 3'. Khan who left Mumbai over the weekend with his family for US seems to have begun shooting immediately. Check out Mr Perfectionist in action. Does he look mean and menacing enough? Aamir as usual would like to keep his looks under wraps but he can’t stop the NRIs on the streets from clicking him.