New Year's Eve Party Stars!

Vegas! Miami! N.Y.C.! Holly Madison, the Kardashians, Rihanna and more pop the cork on 2011

01 of 20

CROWNING GLORY

CROWNING GLORY
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She needs a hottie for that hat! Holly Madison livens up the party in – where else? – Las Vegas on Friday, leading a countdown at Lavo inside the Palazzo hotel.

02 of 20

NOTHIN' LIKE HIM

NOTHIN' LIKE HIM
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Bruno Mars caps off his biggest year yet with a performance at the R Lounge in New York City's Renaissance Times Square Hotel.

03 of 20

COUNTDOWN CUDDLE

COUNTDOWN CUDDLE
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Whatever happened to a simple kiss? Nelly takes a nibble out of longtime love Ashanti while hosting a bash at Haze nightclub in Las Vegas.

04 of 20

FIRED UP

FIRED UP
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In Florida, Kourtney Kardashian lights the new year afire while hosting The Rooftop's party at the Gansevoort Miami Beach.

05 of 20

BOTTLE POPPERS

BOTTLE POPPERS
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Jay-Z and Kanye West crack open the bubbly after their exclusive appearance with Coldplay at The Cosmopolitan hotel's grand opening in Las Vegas, making the afterparty at Marquee the second-hottest ticket in town.

06 of 20

SUNNY START

SUNNY START
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Back from Barbados, Rihanna toasts the new year in Las Vegas with an orange cocktail while hosting the countdown at Pure Nightclub inside Caesars Palace.

07 of 20

MEN IN BLACK

MEN IN BLACK
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John Mayer joins the party onstage, performing with Jay-Z and Coldplay at The Cosmopolitan bash. The Grammy nominee – a surprise guest – landed into Las Vegas after taking a holiday road trip with friends.

08 of 20

LOVE IN VEGAS

LOVE IN VEGAS
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Before mingling with Cameron Diaz at the Jay-Z and Coldplay concert, Jennifer Lopez and Marc Anthony make it a date at the Beatles Love Cirque du Soleil show at The Mirage.

09 of 20

STRIP STAR

STRIP STAR
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Kanye West makes a surprise appearance at the Jay-Z and Coldplay concert in Las Vegas at The Cosmopolitan. Performing "Homecoming," the rapper entertained a star-studded crowd including Beyoncé, Gwyneth Paltrow and Blake Lively.

10 of 20

SILVER BELLE

SILVER BELLE
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Kim Kardashian sparkles and shines as host of Tao Nightclub's New Year's Eve bash at The Venetian in Las Vegas.

11 of 20

DATE NIGHT

DATE NIGHT
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Mark Wahlberg and wife Rhea Durham make it a parents' night out at the private afterparty to wrap up the Jay-Z and Coldplay concert.

12 of 20

HAT'S ON!

HAT'S ON!
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Wearing a rainbow of colors, Nicki Minaj greets the new year with a big smile at Mansion nightclub Miami's South Beach. "HAPPY NEW YEAR my darlingzzz!!!!" she tweeted. "God bless you all with a prosperous 2011!!!!!! :-)"

13 of 20

NEW YEAR, NEW LOVE

NEW YEAR, NEW LOVE
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New Year's Rockin' Eve co-host Jenny McCarthy keeps an eye on the clock with – as she said on Twitter – "the guy I mauled last night," her date Paul Krepelka, a Massachusetts-based sports attorney.

14 of 20

POW, POW, POW!

POW, POW, POW!
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Usher comes on strong – and sweaty! – performing his OMG tour for thousands of fans Dec. 31 at Miami's American Airlines Arena, along with Trey Songz.

15 of 20

YANKEE SPIRIT

YANKEE SPIRIT
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Where's the ball? Alex Rodriguez is on Team Party while out at the Marquee bash hosted by Jay-Z. The star batter dropped into Vegas with Cameron Diaz, catching a show by Florence and the Machine together a night earlier.

16 of 20

ON THE CLOCK

ON THE CLOCK
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"Tik Tok" singer Ke$ha arrives to help Ryan Seacrest count the seconds to midnight in New York's Times Square. The popster performed her hit single – and vowed to make "2011 our b–" – on Dick Clark's New Year's Rockin' Eve.

17 of 20

G-STARS

G-STARS
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It's a Gossip Girl-Glee mashup! Chace Crawford makes a point to Mr. Shuester (Matthew Morrison) at the Fontainebleau Poolside on New Year's Eve.

18 of 20

MAN OF THE HOUR

MAN OF THE HOUR
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Dapper host Jamie Foxx takes the stage at LIV inside Miami Beach's Fontainebleau hotel, where Kaskade also performed.

19 of 20

WORKING IT

WORKING IT
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Celeb deejay Samantha Ronson takes the mic at the afterparty following the Jay-Z and Coldplay show.

20 of 20

PARTY BOYS

PARTY BOYS
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Surfer Kelly Slater and Jeremy Piven hug it out and hang ten at Jay-Z's private afterparty at Marquee.

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