David Letterman Puts Lindsay Lohan in the Hot Seat

By now we're all aware of Lindsay Lohan and her antics. Right now she's making the media rounds, promoting her cameo in the movie 'Scary Movie 5.' She stopped by the Late Show with David Letterman to give the film a plug. But Letterman wasn't interested in talking about the movie. He grilled Lohan on her latest stint in rehab, asking her exactly what she was addicted to.