Who played Johnny Cash in 'Walk the Line'?

Who played Regina George in 'Mean Girls'? In which film is Regina George a character? Who played Elle Woods in 'Legally Blonde'? In which film is June Carter a character? In which film is Johnny Cash a character? Who played Miranda Priestly in 'The Devil Wears Prada'? Who played Andy Sachs in 'The Devil Wears Prada'? In which film is Andy Sachs a character?