Photo SpecialRock Stars: Big Rings!

Who has the largest diamond? Check out the rings on Katie, Jen, Avril and seven other stars. By Janice Morris

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AVRIL LAVIGNE

Lavigne, 20, courted engagement rumors last year with a mystery ring on her left hand, but that one was just for fun. This time it's for real: The singer said yes to her boyfriend of one year, Sum 41 frontman Deryck Whibley, 25, during their June 24 weekend in Venice, Italy.

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