pbr Amy Winehouse has apparently reduced a pub crowd to tears, for all the right reasons, during an impromptu gig.br ppbr According to the Daily Mirror, the Back to Black singer got up on stage during a charity gig at her local, the Hawley Arms in Camden, and gave a pitch perfect performance of Tears Dry On Their Own.br ppbr The 27-year-old is then said to have carried on singing whilst Sadie Frost's ex Kristian Marr on guitar.br ppbr Meanwhile Amy claims she has been drug-free for three years.br ppbr Speaking to Glamour magazine, the troubled star said: "I'm much healthier now. I used to use drugs and I haven't used drugs in almost three years. It's not a hard thing."br ppbr She also revealed she is thinking about having children:br ppbr "I'm of the age when you start thinking about it - not seriously - but you start thinking about having kids. Although I'm not going to be getting pregnant in the next nine months.