FACTBOX: Buffett tops list of world's billionaires

(Reuters) - Warren Buffett, the famed U.S. investor who heads Berkshire Hathaway Inc, has replaced his friend Microsoft Corp founder Bill Gates as the richest man in the world, Forbes magazine said on Wednesday.

The following are the top 10 billionaires as estimated by the magazine: RANK NAME WORTH) COUNTRY SOURCE OF

(BLN) WEALTH 1 Warren Buffett $62 U.S. Berkshire Hathaway 2 Carlos Slim $60 Mexico Telecoms 3 Bill Gates $58 U.S. Microsoft Corp 4 Lakshmi Mittal $45 India Steel 5 Mukesh Ambani $43 India Petrochemicals 6 Anil Ambani $42 India Diversified 7 Ingvar Kamprad $31 Sweden IKEA 8 K.P. Singh $30 India Real Estate 9 Oleg Deripaska $28 Russia Aluminum 10 Karl Albrecht $27 Germany Aldi supermarkets

Source: Forbes Magazine, (http://www.forbes.com/billionaires)

Data reflects estimates of worth made on February 11, 2008 (Compiled by Emily Chasan; Editing by Eric Walsh)