Rock Stars: Big Rings!

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

01 of 09

KATIE HOLMES

KATIE HOLMES
MJ Kim/Getty

"It's very age-appropriate for Katie," says jeweler Fred Leighton of the Edwardian-style, oval-shaped diamond of about five carats that Tom Cruise, 42, slipped on her finger June 17 at the Eiffel Tower. So when's the wedding? "Soon, soon," Holmes, 26, says.

02 of 09

AVRIL LAVIGNE

AVRIL LAVIGNE
X17

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.

03 of 09

JENNIFER GARNER

JUNE 8
Flynet; Ramey

Though the just-hitched couple of Ben Affleck, 32, and Garner, 33, never announced an engagement, she wasn't hiding her tell-tale ring: a diamond-studded eternity band. And with the wedding, the two have let another not-so-well-kept secret out of the bag – they're expecting their first child.

04 of 09

PARIS HILTON

PARIS HILTON
Niki Nikolova/FilmMagic; x17

After scoping out 10 rings (and taking two for test runs), the heiress finally has her rock – all 23-plus carats of it. Hilton, 24, had trouble picking a sparkler after accepting a proposal from boyfriend Paris Latsis, 22, in May, but she finally chose a white-diamond piece from a private dealer and designer. "The ring is beautiful," says a source, "and she's happy."

05 of 09

TRISHA YEARWOOD

TRISHA YEARWOOD
Kevin Parry/WireImage; Tammie Arroyo/AFF-USA

"You're not going to (do this) in front of all these people?" Yearwood, 40, asked before Garth Brooks, 43, bent his knee in front of 7,000 fans in Bakersfield, Calif., in May and asked her to marry him. And while the happy couple is staying mum on wedding details, Brooks said: "I'm just glad she said yes."

06 of 09

BRITNEY SPEARS

BRITNEY SPEARS
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Married since September, mom-to-be Spears, 23, has already upgraded to Wedding Ring 2.0, a gift from husband Kevin Federline, 27. "I think it was because he wanted to buy her the diamond ring," a source close to the singer tells PEOPLE about the new 5.5-carat round solitaire. It replaces the five-carat rock she picked out from jewelry designer Cynthia Wolff last year.

07 of 09

NICOLE RICHIE

NICOLE RICHIE
Mario Anzuoni/NY POST/Splash news; AXELLE/BAUER-GRIFFIN

She wants elephants, salsa dancing and bridesmaid Lindsay Lohan all under one wedding tent, so it's no wonder Nicole Richie, 24, has engagement bling like no other ("I have quite an imagination," she says). Her diamond-and-pink-sapphire ring came courtesy of Adam "DJ AM" Goldstein, 32, in February, but the two have yet to set a date for their nuptials.

08 of 09

NICOLLETTE SHERIDAN

NICOLLETTE SHERIDAN
Nancy Kaszerman/ZUMA; Bill Davila/startraksphoto

"It was very sweet and romantic," the Desperate Housewives star, 41, says of her proposal last winter in Aspen from Swedish actor Niklas Soderblom, 40. And to match the Colorado snow: a white-diamond Tiffany engagement ring that Soderblom selected on his own. The two have yet to set a wedding date.

09 of 09

CHRISTINA AGUILERA

CHRISTINA AGUILERA
Flynet; AXELLE/BAUER-GRIFFIN

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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