Knightley: I'm coping because I'm not a drug addict

Keira Knightley insists she must be coping with being famous because has not become a drug addict.

The 29-year-old actress shot to fame as a teenager in 2002 comedy/drama movie 'Bend It Like Beckham', and she feels grateful that she hasn't gone down the route of becoming addicted to illegal substances like some celebrities who became famous at an early age.