Bill Gates is worth $53 billion -- but that wasn't enough to take the top spot on Forbes' World's Billionaires list this year.

World's Billionaires
The Microsoft head honcho was edged out by Mexican telecom mogul Carlos Slim Helu -- who is worth $53.5 bil.

Other celebs who made the list: George Lucas and Steven Spielberg (worth $3 billion a piece), Oprah Winfrey ($2.4 bil), and Harry Potter scribe J.K. Rowling, who's worth an estimated $1 billion.

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