Charlie Sheen doesn't recognise the "alien version" of himself at the height of his addiction issues after six years sober.

The former 'Two and a Half Men' star gave up drugs and booze back in 2017 and stepped away from the spotlight as he battled his substance abuse issues but he's now revealed he will celebrate six years clean in January and he feels "proud" of the new "consistent" life he has built for himself.

He told PEOPLE: "Next month I'll be six years sober. I have a very consistent lifestyle now. It's all about single dad stuff, and raising my 14-year-old twin boys Max and Bob [with ex Brooke Mueller]."

Sheen - who is also dad to Sami, 19, and Lola, 18, with his ex-wife Denise Richards - admits he used to drink in the mornings and would even have scotch in his coffee, but he vowed to sober up after realising he was too drunk to take one of his daughters to an early appointment.

He explained: "One morning I'd forgotten my daughter had an appointment I'd promised to drive her to, and I'd already had a couple of pops that day. So had to call my friend Tony to take us. We got her there on time, but it broke my heart because she was in the backseat and I could just tell she was thinking, 'Why isn't dad driving?' So I got home and sat with that for the rest of the day. And the next morning I just stopped."

Sheen went on to explain he decided to quit booze for a month, but kept going after realising how much it improved his life: "There was just instant evidence that this was the side I needed to be on. I couldn't be in denial about it anymore."

The actor concluded: "I'm proud of the choices that I've made and the changes I've made to live a life today that will never look like that mess. That was some alien version of myself."