Charlie Sheen appeared on The Late Show on Monday and opened up about everything from his meltdown to wanting to appear on the series finale of Two and a Half Men but David Letterman seemed to be chasing after a bigger piece of news.  At one point during their chat, the host began to coax the Anger Management actor by saying, "You are going to be, in the next several months...fill in the blanks." Charlie responded, "Grandfather." He added that while the news may be fabulous, "Grandpa" is not a title that the 47-year-old is ready to adopt.  Charlie's daughter Cassandra Estevez is expecting her first child with husband Casey Huffman whom she married in 2010.