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Billy Joel's daughter is thanking fans for their concern after collapsing onstage in New York Saturday. 

People says Alexa Ray Joel collapsed while playing a show at Cafe Carlyle.  The singer was taken to the emergency room and diagnosed with what's called vasovagal syncope, a condition that causes fainting after a sudden drop in heart rate. 

Alexa Ray, whose mother is model Christie Brinkley, said she was excited about fulfilling her final performance and hopes to make it up to the audience "very soon." 

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