Charlie Sheen has announced “fabulous” news – that he is going to become a grandfather. The 47-year-old actor revealed on David Letterman that his 28-year-old daughter Cassandra Estevez and her husband were expecting their first child, the Daily Mail reported. “Me as a grandfather, Dave… I don’t know. It’s like the world’s going to crack in half,” he joked. But he quickly added saying, “It’s fabulous. It’s just not a title I’m ready to adopt.” Cassandra is Sheen’s daughter with his high school girlfriend Paula Profit, and was born when he was 19. He gave her away in 2010 when she married her high school boyfriend Casey Huffman. Along with his oldest daughter Sheen is also a father to daughters Sam, eight, and Lola, seven, with second wife Denise Richards, and three-year-old twins, Bob and Max, with third wife Brooke Mueller.