United Kingdom, March 26 -- Charlie Sheen's ex-wife Brooke Mueller is a "stage four" addict and "it's just a matter of time" until she relapses.

The 47-year-old actress - who is mother to 16-year-old twins Bob and Max with Charlie - has spent much of her life struggling with addiction issues and spent six years sober before relapsing in 2023 - and she's now admitted she's always at risk of another setback.

She told PEOPLE: "When we're at stage four, it typically means that cycle where you just have these relapses, no matter how well you get, and no matter how many years, it's just a matter of time. I want to be honest about it, because if I try to sugarcoat it, I'd be lying to myself.

"The darkness and the shame as we get older, that s...