Lenny Kravitz may party like a rock star ... but you'd never know it.
Here's the 25-year-old singer back in 1989 (left) -- and 20 years later, the 45-year-old version in London last month (right).
Are you gonna go his way?
or Good Docs?
7/12/2009 2:01 AM PDT BY TMZ STAFF
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