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The Global Citizen Festival brought out thousands of fans to New York's Central Park Saturday - and Beyonce.  The pop superstar was a surprise drop-in at the concert event, showing up to help husband and scheduled performer Jay Z close out his set and the show - just weeks after wrapping up their highly successful joint tour. 

The Global Citizen Festival also included performances by pregnant stars Carrie Underwood and Alicia Keys, No Doubt, Sting, The Roots, fun and Tiesto.  

The Global Citizen Festival aims to inspire people to work toward ending extreme poverty around the world.  Concert attendees had to earn their way into Saturday's event by showing their support for various causes. 

Photos: Getty Images