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Jennifer Hudson turns 31 on Sept. 12, 2012. The singer is known for her music career and was a finalist on 'American Idol' during season 3 in 2004. She later won an Oscar for her supporting role in the movie 'Dreamgirls' and earned a Grammy in 2008.
Hudson is also a spokesmodel for Weight Watchers and lost about 80 pounds with the help of the diet program.
(Pictured: Jennifer Hudson talks to OnTheRedCarpet.com at the premiere of the 2012 romance comedy 'Think Like a Man' in Los Angeles.)