Kellan Lutz looks polished at The Cosmopolitan Grand Opening and New Year’s Eve Celebration at Marquee Nightclub in Las Vegas.

Emmy Rossum is gorgeous arriving at The Cosmopolitan Grand Opening and New Year’s Eve Celebration.

Christina Aguilera is spotted with her boyfriend Matthew Rutler, leaving the Ivy Restaurant after lunch in West Hollywood, CA.

David Hasselhoff relaxes in a big comfy chair at the Ritz Carlton Hotel before his appearance at the New Year Party Brandenburg Gate in Berlin, Germany.

Gorgeous couple Marc Anthony and Jennifer Lopez attend The Beatles Love by Cirque du Soleil at The Mirage in Las Vegas, Nevada.

Rihanna rocks a red cut-away dress for a New Year’s celebration at the Pure Nightclub at Caesars Palace in Las Vegas, Nevada.

‘Jersey Shore’ star Paul ‘Pauly D’ DelVecchio hosts the Newyearseve.com 2011 party at Espace in New York City.

Kanye West toasts the New Year with a glass of champagne onstage at The Cosmopolitan Grand Opening and New Year’s Eve Celebration in Las Vegas, Nevada.

Holly Madison is sexy in sparkles hosting the New Years Eve Party at Lavo at the Palazzo in Las Vegas, Nevada.

Carson Daly gives 2011 the thumbs up, celebrating the New Year in Times Square in New York City.

Sean ‘Diddy’ Combs hosts New Year’s Eve Celebration at LAX Nightclub inside the Luxor Hotel and Casino in Las Vegas, Nevada. Guests munched on Trident Vitality gum at the stroke of midnight!

‘The Real Housewives of Atlanta’ star Kim Zolciak sizzles in a skin-tight dress at ‘Watch What Happens Live – Andy’s New Year’s Party’ at the Bravo Club House in New York City.

Hugh Hefner and fiancee Crystal Harris ring in the New Year together at the Playboy Mansion.