Keira Knightley has hit out at Britney Spears and Lindsay Lohan for being caught out pantyless - insisting she has too much class to follow in their footsteps. The English actress is appalled by celebrities who expose themselves to photographers, and claims their actions make them "s**ttier than everybody else". Speaking at the Venice Film Festival, Knightley says, "I'm not going to get blind drunk and then stumble out and fall over an puke up in front of people. "I'm not saying I don't do that in private, but I try not to. "The whole celebrity thing is not magic. They're real people proving they're s**ttier than everybody else because they don't even wear knickers."