British pop star Robbie Williams has shattered the myth that celebrities are pampered in rehab - branding addiction treatment centres "horrendous" and full of "nutters".
The Angels hitmaker has endured several stints in rehab, most recently when he was admitted to a facility in Arizona in 2007 to help deal with his prescription drug habit.
And the star is convinced the public's belief that stars are given a luxurious break when they are admitted is far from the truth - because rehab centres are often dark, depressing places.
He says, "It's embarrassing having to go to rehab again, knowing what's to come and the boredom that you're going to have while you're there, and being scared of the people that are in there. Is anybody going to be your kind of nutter? Because they are all nutters, including myself.
"Everyone thinks rehab's this place that's a bit like a health farm where you go and get pampered. I was in a hospital ward with four other people in single beds, and it's horrendous in there."