Charlie Sheen: Grandfather. You can’t picture it can you, the 47 year-old has been wearing out people half his age with his partying ways and hedonistic lifestyle. Yet, appearing on David Letterman’s Late Show, Sheen confirmed that Grandfatherhood was exactly what he was headed for, with his 28 year-old daughter Cassandra Estevez set to give birth to her first child.

Sheen was chided into giving the news by Letterman, with the show host teasing "You are going to be, in the next several months ... fill in the blanks. You are going to be a ... " Sheen happily finished his sentence off, saying "Grandfather," going on to enthuse about the role. He did, however, say that he wasn’t so ready to embrace the title of Grandfather; "Me as a grandfather, Dave ... I don't know. It's like the world's going to crack in half” he quipped.

Those surprised at the news should – firstly – realise that just because Sheen enjoyed a bit of a nutty 2011 doesn’t mean his daughter’s going to decide she doesn’t want a sprog just so her dad can maintain an image of a carefree wildcard. They should also remember that Sheen’s always been serious about fatherhood; in 2010 he was delighted to accompany Estevez down the aisle as she got married, and you can well believe that he’ll actually make a pretty top notch Grandparent. Just don’t let him take the tot out at night perhaps.

Charlie Sheen arrives at Letterman Show

Charlie Sheen arrives at The Late Show on Monday (January 14)