While many of today's brightest stars spent New Year's Eve 2013 performing live for all of their fans, others were busy partying and spending time with close friends.

Before he hit the stage for New Year's Rockin' Eve in L.A., Justin Bieber posed with his buddy Lil Twist and sipped on something bubbly, while One Direction member Harry Styles smooched his lady love Taylor Swift following her performance in Times Square. Like the lady in 'Red,' Kesha also performed on New Year's Eve 2013, and she later tweeted a picture of herself partying with those classic NYE shades.

Elsewhere, Rihanna and Chris Brown were up all night doing God know's what (but we have a hunch it began with "s" and ended with "x"), and Beyonce kept it classy with a New Year's Eve note and intimate performance for her fans in Vegas. Her hubby Jay-Z was performing in Brooklyn, and Big Time Rush member Kendall Schmidt took in the Jay-Z / Coldplay show from his seat at the Barclays Center. Meanwhile, Carlos Pena Jr. and his new girlfriend Alexa Vega spent the holiday in the Bahamas partying and bike riding with friends.

See more pics of pop stars celebrating New Year's Eve 2013, including Jennifer Lopez's fancy dinner party, Rita Ora's boozy, skydiving adventures in Dubai and Mariah Carey's Australian performance with her fam!

Justin Bieber + Lil Twist in L.A.

Justin Bieber Lil Twist New Year's Eve
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Taylor Swift + Harry Styles in Times Square, N.Y.C. [WATCH THEM KISS]

Taylor Swift Harry Styles New Year's Eve
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Taylor Swift Harry Styles New Year's Eve
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Kesha Celebrating After Performing at MTV's Club New Year's Eve

Kesha New Year's Eve
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Rihanna + Chris Brown in Bed Together

Rihanna Chris Brown New Year
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Beyonce Performing Live in Las Vegas + a Note She Published

Beyonce New Year's Eve
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Beyonce New Year's Eve
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Coldplay + Jay-Z Performing in Brooklyn, N.Y.

Coldplay JayZ New Year's Eve
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Kendall Schmidt's View From the Jay-Z + Coldplay Show in Brooklyn

Kendall Schmidt Coldplay JayZ New Year's Eve
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Carlos Pena Jr., Alexa Vega + Friends Vacationing in the Bahamas

Carlos Pena Jr Alexa Vega New Years
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Carlos Pena Jr Alexa Vega New Years
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Carly Rae Jepsen + M.C. Hammer in Times Square, N.Y.C.

Carly Rae Jepsen MC Hammer New Year's Eve
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Psy, M.C. Hammer, Carly Rae Jepsen + Tyler Glenn of Neon Trees in Times Square, N.Y.C.

Psy MC Hammer Carly Rae Jepsen Neon Trees New Year's Eve
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Pitbull Performing in Times Square, N.Y.C.

Pitbull New Year's Eve
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Jason Derulo + Jordin Sparks Celebrating Together

Jason Derulo Jordin Sparks New Year's Eve
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Jennifer Lopez Prepping for Her New Year's Eve Dinner Party

Jennifer Lopez New Year's Eve
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Rita Ora + Friends Partying and Skydiving in Dubai

Rita Ora New Year's Eve
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Rita Ora New Year's Eve
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Ellie Goulding Celebrating in Dubai

Ellie Goulding New Years Eve
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Calvin Harris Ringing in 2013 With Some Zebras

Calvin Harris New Years Eve
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Mariah Carey, Nick Cannon + Their Twins on Stage in Australia

Mariah Carey Nick Cannon New Year's Eve
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Mariah Carey Nick Cannon Twins New Year's Eve
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