The 39-year-old singer has battled alcohol and substance abuse in the past and though he knows it is important to stay sober, he sometimes misses his hard partying ways, reported Contactmusic.
"In the misery of chemical addiction and alcoholism it's not all... How can I put this..You know, you don't have a drink and go straight to rehab. There were some enjoyable times too. It would kill me, but I had a lot of fun," Williams said.
"Am I separated from that person who I used to be? It's very, very easy for me to be in a similar sort of position, in a similar sort of place. There's still a place in my heart that wants to 'ave it," he said.