"Grandpa" Charlie? Has a nice ring to it! US Magazine reports that Charlie Sheen will become a grandfather for the first time this year. His oldest daughter, Cassandra Estevez is pregnant, and the actor confirmed the good news when he appeared on The Late Show with David Letterman earlier this week.

Sheen told Letterman, "Me as a grandfather, Dave...I don't know. It's like the world's going to crack in half. It's fabulous. It's just not a title I'm ready to adopt."

Will be Charlie make a good grandfather? Well David Letterman was curious too, and in true Charlie Sheen fashion he responded with, "Well, yeah, because you can leave the kid!"

Oh, Charlie .. or should we say Grandpa Charlie now. 

Sheen's ex-wife Denise Richards also confirmed the news via Twitter:

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