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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CHRISTINA AGUILERA

Music exec Jordan Bratman found just the right ring for his February proposal to Aguilera. With a five-carat diamond-and-platinum sparkler designed by London jeweler Stephen Webster, Bratman, 27, got down on one knee and asked the 24-year-old pop star to be his wife. It "couldn't have been more perfect," she says.

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