Who, What, Where - New Years Eve: Rihanna, The Kardashians, Lady Gaga

Lady Gaga smooches - with a decorative New Years sphere - while ringing in the new year with Mayor Michael Bloomberg in NYC’s Time Square, sponsored by NIVEA. 

Rihanna rings in the new year with Sean “Diddy” Combs and co. at his CIROC: The New Year 2012 bash in Miami. 

Six-time No. 1 Billboard dance artist Erika Jayne performs her new single “Party People (Ignite the World)" at MATINEE NYC’s New Years Eve event. 

Fergie - with hubby Josh Duhamel in town - hosts the grand opening of The Mirage’s 1 OAK Las Vegas while celebrating the new year.

Reality TV queens Lauren Conrad and 

Stephanie Pratt joined Eliza Dushku, Leona Lewis, and Wilmer Valderrama at the Hyde Bellagio celebration in Las Vegas. 

Real Housewives' Gretchen Rossi, Taylor Armstrong, Kim Zolciak, Alexis Bellino 

and Kandi Burress split up to host CIROC The New Year 2012 events in New York, LA, Miami Beach, Houston and Chicago. 

Three Kardashians, three different Las Vegas New Years Eve celebrations. Kim hosted a party at TAO with mom Kris Jenner by her side, Kourtney and Scott Disick hosted Sugar Factory’s New Years eve soiree with fellow E! star, Holly Madison, while Rob Kardashian hosted solo at Wynn's Tryst Nightclub. So where was Ms. Khloe? 

Stevie Wonder, Tyrese Gibson and Kyle Richards toast the new year at The Cosmopolitan of Las Vegas’ NYE soiree. 

[Image: Getty]