You'd be smiling, too: Bill Gates is still the richest person in America.
NEW YORK (CNNMoney) -- Philanthropist Bill Gates is still the richest person in America, followed by investing guru Warren Buffett, according to an updated list of leading billionaires.
Microsoft (MSFT, Fortune 500) co-founder Gates retained his top spot on the annual Forbes 400 list of Richest Americans with a personal fortune of $59 billion. Buffett, the chief executive of Berkshire Hathaway (BRKA, Fortune 500) who has donated much of his wealth to Gates' charities, is in second place with $39 billion.
Investor George Soros, founder of Open Society Foundations, joined the top 10 for the first time, as the seventh-richest with $22 billion.
The list also welcomed 18 new members, including Sean Parker, pioneer of Napster and Facebook, in 200th place, and John Henry, major owner of the Boston Red Sox, in 375th place. 
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