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Gwen Stefani holds her son Apollo as they attend the men's singles semifinal match between Roger Federer of Switzerland and Marin Cilic of Croatia on Day Thirteen of the 2014 US Open at the USTA Billie Jean King National Tennis Center on September 6, 2014 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Streeter Lecka/Getty Images)

U.S. Open celebrity sightings

With a prime location like New York, the U.S. Open has become a star-studded sporting event. Catch photos of the celebrities in the stands.