OK, this might be the most surprising yearbook photo we've ever posted. If we told you this cheerful young man grew up to be a multi-millionaire, you wouldn't be surprised, right? But, you'd probably think he made that money in, say, the computer software industry.

Wrong! This guy is the bass player and songwriter for one of hard rock's most notorious bands, a group that continues to play in front of sellout crowds and command headlines on an almost daily basis. He's also become a highly respected author, photographer, clothing designer and radio host in recent years. Think you know who it is?