The 33-year-old musician, who entered rehab in 2005 to be treated for alcoholism, said fatherhood made him re-access his life and clean up his act, reported Contactmusic.
''It (having children) was the only thing that changed me, If I'm honest. I was a bit of a naughty boy and I always knew that I couldn't keep it up forever, but nothing would stop me!
"Then I had a daughter and I was like, 'See ya!' It was the biggest fork in the road for me," Willis said.
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