Stars' New Year's Parties!

Toast 2010 with Christina Aguilera, Nicole & Joel, Lauren Conrad and more Hollywood dazzlers

01 of 14

KEEPS GETTIN' BETTER

KEEPS GETTIN' BETTER
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Happy New Year! Christina Aguilera welcomes 2010 with open arms at Tao nightclub at Las Vegas's Venetian hotel, where she hosted and performed. Her resolution? "To continue having the best life ever."

02 of 14

BLAST OFF

BLAST OFF
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Sparks fly between NBA star Tony Parker and wife Eva Longoria Parker (in an Ina Soltani dress ), who counted down to midnight at the grand opening of her new Las Vegas nightclub Eve.

03 of 14

SEALED WITH A …

SEALED WITH A
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Kiss! Josh Duhamel rushed to the platform at club LAX just after midnight to give a sweet smooch to wife Fergie – in front of hundreds in Las Vegas who had just watched her perform with the Black Eyed Peas.

04 of 14

BLACK & GOLD

NEW YEAR'S COUPLE
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Also making it a couples night in Las Vegas: deejay Joel Madden and Nicole Richie, who co-hosted a party at LAVO.

05 of 14

POP STAR

POP STAR
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At her New Year's Eve concert in New York's Madison Square Garden, Mariah Carey toasted 2010 with a glass of Champagne and a very special guest: husband Nick Cannon, who manned the deejay platform and ended the set by kissing his wife (not pictured).

06 of 14

LADIES NIGHT

LADIES NIGHT
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Back in Hollywood, Lauren Conrad and her girls – Stephanie Pratt (left) and Lo Bosworth – partied at Beso, but at least one of them was feeling the effects New Year's Day: "My legs are so sore from dancing!" Pratt Tweeted.

07 of 14

NY STATE OF LOVE

NY STATE OF LOVE
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Even among the million-plus revelers crowded into New York City's Times Square, Jennifer Lopez and Marc Anthony found a little space for romance under the bright lights.

08 of 14

STEPPING UP

STEPPING UP
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From "Let's Get Loud" to just kickin' it: J.Lo and Marc Anthony join host Ryan Seacrest on Dick Clark's New Year's Rockin' Eve to form their own Rockettes line in Times Square.

09 of 14

SO MONEY

SO MONEY
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Dad-to-be Robin Thicke held court at Las Vegas's The Bank nightclub in the Bellagio alongside wife Paula Patton, where he sang to hundreds of partygoers – including singer Leona Lewis (not pictured).

10 of 14

NEW SIGHTS

NEW SIGHTS
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Goodnight, 2009 ... Good morning, 2010! 90210 star AnnaLynne McCord sees in a new set of numbers while hosting a party at W South Beach. And who'd she kiss? She told guests her peck would be reserved for sister Angel. Aww ...

11 of 14

TWILIGHT NIGHT

TWILIGHT NIGHT
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In all black and with a devilish grin, New Moon star Kellan Lutz raises his glass to the new year at the JustJared.com party at Miami's Klutch nightclub.

12 of 14

GONE GAGA

GONE GAGA
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All hail the queen! Decked in a headdress, Lady Gaga counts down to midnight at the pool of Miami's Fontainebleau. She even stayed at the hotel like a queen – in a $35 million penthouse that rents for $15,000 a night!

13 of 14

SLICK START

SLICK START
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Here's The Situation: It's time to party! Snooki (third from right) and the rest of the Jersey Shore crew ring in 2010 on MTV News Presents: Top 9 of ‘09 before heading out to N.Y.C. club Tenjune.

14 of 14

WHEN IN VEGAS ...

WHEN IN VEGAS ...
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From the turntables to the mic, Pete Wentz celebrated rock-star style (tattoos and all!) at JET nightclub at The Mirage – but it seems he had something else on his mind, Tweeting: "Missing @ashsimpsonwentz in town."

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