Charlie Sheen had one of the most famous melt downs of recent celebrity news, equalled only by the Britney Spears' shaving-her-head incident. His spiral down into mental health and drugs problems spawned some popular catch phrases including 'bi-winning' and 'I got tiger blood', but two years on and his life seems to resemble something that's back on track. He popped in to see David Letterman on the Late Show for a chat and to promote his latest television series 'Anger Management'.

Of course, Letterman asked him the kind of questions that everyone wants to answer to. Namely, did crack cocaine have a part to play in his break down? Sheen replied: "Here's the confusing part... I wish it was crack cocaine. It wish it was an ocean of vodka, a bathtub full of pills... It was just my brain was kind of separated into itself. I just had to take a stand for what I know was right."

He also admitted to wanting to head back to Two and a Half Men, despite his character getting killed off. "I would like to go back. I would like to appear on their final episode." He said, adding: "I am dead, but so is the show!" Finally, in the most positive news of the evening, Sheen has also said that his daughter is expecting a baby, which will make him a grandpa for the first time! The prospect of it is 'fabulous' he said, admitting however that the title of 'Grandpa' is not one he's ready for yet.