Bono
He's not just the lead singer of rock group U2. He's also a managing director and co-founder of Elevation Partners, an investment firm focused on the media, entertainment and technology industries. Elevation reportedly bought 2.3 percent of Facebook for $90 million in 2009 — a stake that will be worth more than $1.5 billion at the IPO price. So you can add World's Richest Rock Star to Bono's titles.
