The 47-year-old Anger Management star made the announcement on Monday night after much probing by host David Letterman who questioned, "You are going to be, in the next several months? Fill in the blanks… You are going to be a…"
"Grandfather," Charlie said with a grin, admitting that while "it's fabulous," it's still "not a title I'm ready to adopt."
As RadarOnline.com previously reported, Charlie also admitted in the same interview that he's still using drugs saying, “I don’t really believe in that lifestyle anymore cause it doesn’t seem fair — you guys don’t want me clean and sober, that’s boring!”
Which may explain why Charlie's excited to be a grandfather -- "…because you can leave the kid!" he joked.
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Cassandra, 28, is Charlie's daughter from his high school sweetheart, Paula Speert.