New Year's Eve Party Stars!
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.
NOTHIN' LIKE HIM
Bruno Mars caps off his biggest year yet with a performance at the R Lounge in New York City's Renaissance Times Square Hotel.
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.
In Florida, Kourtney Kardashian lights the new year afire while hosting The Rooftop's party at the Gansevoort Miami Beach.
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.
MEN IN BLACK
LOVE IN VEGAS
Kim Kardashian sparkles and shines as host of Tao Nightclub's New Year's Eve bash at The Venetian in Las Vegas.
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.
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!!!!!! :-)"
NEW YEAR, NEW LOVE
POW, POW, POW!
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.
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.
ON THE CLOCK
"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.
MAN OF THE HOUR
Dapper host Jamie Foxx takes the stage at LIV inside Miami Beach's Fontainebleau hotel, where Kaskade also performed.
Celeb deejay Samantha Ronson takes the mic at the afterparty following the Jay-Z and Coldplay show.
Surfer Kelly Slater and Jeremy Piven hug it out and hang ten at Jay-Z's private afterparty at Marquee.