I was listening to Main Laapata from Ek Tha Tiger. First thought was female singer is Shreya Ghoshal becuase voice is so close to sounding like Shreya Ghoshal but surprised to know that singer is Palak Munchhal. Even more surprised after reading her biography at wiki. Hats Off to this 20 year old singer for her great achievements in social work.
Have a look at this