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Rihanna performs at the O2 Arena in London - December 20, 2011.

Rihanna performs at the O2 Arena in London - December 20, 2011.

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Rihanna @ Day 1 of The Jingle Bell Ball in London December 3, 2011.

Rihanna @ Day 1 of The Jingle Bell Ball in London December 3, 2011.

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Rihanna live in Manchester - October 9, 2011.

Rihanna live in Manchester - October 9, 2011.

(Source: ffamouspeople)

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Britney Spears performing at Nancy, France - October 5, 2011.

Britney Spears performing at Nancy, France - October 5, 2011.

(Source: ffamouspeople)

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Britney Spears performs her Femme Fatale tour at Palais Omnisports de Bercy in Paris, France - October 6, 2011.

Britney Spears performs her Femme Fatale tour at Palais Omnisports de Bercy in Paris, France - October 6, 2011.

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Rihanna during her Loud Tour in London - October 6, 2011.

Rihanna during her Loud Tour in London - October 6, 2011.

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Rihanna performs at the o2 Arena in east London - October 5, 2011.

Rihanna performs at the o2 Arena in east London - October 5, 2011.

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Rihanna performs live in Belfast - September 30, 2011.

Rihanna performs live in Belfast - September 30, 2011.

(Source: ffamouspeople)

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Fergie @ CHASE presents The Black Eyed Peas and Friends “Concert 4 NYC” benefiting the Robin Hood Foundation at Central Park - September 30, 2011.

Fergie @ CHASE presents The Black Eyed Peas and Friends “Concert 4 NYC” benefiting the Robin Hood Foundation at Central Park - September 30, 2011.

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Shakira performs during the Rock in Rio music festival - September 30, 2011.

Shakira performs during the Rock in Rio music festival - September 30, 2011.

(Source: ffamouspeople)

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Katy Perry performs in concert at the Pepsi Music festival in Buenos Aires, Argentina - September 27, 2011.

Katy Perry performs in concert at the Pepsi Music festival in Buenos Aires, Argentina - September 27, 2011.

(Source: ffamouspeople)

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Lady Gaga performs at the iHeartRadio Music Festival in Las Vegas - September 24, 2011.

Lady Gaga performs at the iHeartRadio Music Festival in Las Vegas - September 24, 2011.

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Britney Spears performs at the Ice Palace in St. Petersburg - September 22, 2011

Britney Spears performs at the Ice Palace in St. Petersburg - September 22, 2011

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Rihanna performs at the Nilson Nelson Gymnasium in Brasilia, Brazil -  September 21, 2011 

Rihanna performs at the Nilson Nelson Gymnasium in Brasilia, Brazil - September 21, 2011 

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Rihanna performs during her “Loud Tour” in Sao Paulo, Brazil - September 17, 2011.

Rihanna performs during her “Loud Tour” in Sao Paulo, Brazil - September 17, 2011.