Pope Francis Celebrates 78th Birthday with Cake, Mate and Tango.

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  Tony Gentile / Reuters

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  Pope Francis smiles as he arrives to lead his general audience at the Vatican on Dec.17, 2014. 
  
  There was a festive atmosphere at the weekly General Audience on Wednesday in St. Peter's Square, as Pope Francis celebrated his 78th birthday.
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  Alessandra Tarantino / AP

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  Pope Francis blows candles on a birthday cake in St. Peter's Square.
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  Gregorio Borgia / AP

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  A couple dances tango in front of St. Peter's Square Hundreds of tango dancers from all over the world gathered just next to St. Peter's Square for a milonga to mark Pope Francis' 78th birthday.
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  Tony Gentile / Reuters

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  Pope Francis greets priests as he arrives to lead his general audience.
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  Alberto Pizzoli / AFP - Getty Images

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  Pope Francis sips "mate" at St Peter's square at the Vatican. Yerba mate is a popular coffee alternative in Argentina.
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  Franco Origlia / Getty Images

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  Pope Francis waves to the faithful as he arrives in St. Peter's Square.
• There was a festive atmosphere at the weekly General Audience on Wednesday in St. Peter's Square, as Pope Francis celebrated his 78th birthday.
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• Source http://www.nbcnews.com/