Justin lost to Gaga for the Most Twitter Followers - she had 11,259,372 as of June 29 - but the singer did take the title for Most Popular Video of Any Kind Online, with his tune Baby snagging 463,820,304 views as of February 16, 2011.
J.K. Rowling received First Billionaire Author, with her seven Harry Potter books selling more than 400 million copies worldwide.
Pirates of the Caribbean star Johnny Depp managed to score the Highest Paid Actor [$75 million], and Sandra Bullock was named the Highest Paid Actress [$56 million], while Miranda Cosgrove is listed as the Highest Paid Child Actress [$180,000 per iCarly episode].
Other celebrities that feature in the list include Hugh Laurie as the Highest Paid Actor in a TV Drama [$400,000 per House episode], Prince William and Kate Middleton for Most Live Streams for a Single Event [72 million streams for the Royal Wedding] and Rihanna, who received the Most US #1 Singles in a Year [Female] for her four singles - Rude Boy, What's My Name, Love The Way You Lie and Only Girl.
The Guinness Book of World Records is set to hit stores in the US on September 15.