FILE - In this Monday, March 4, 2013 file photo, Canadian singer Justin Bieber performs at the O2 Arena in east London. Bieber is recovering after fainting backstage at a concert in London. A spokeswoman for Bieber said Thursday, March 7, 2013, that the 19-year-old pop star was given oxygen and took a 20-minute reprieve after fainting backstage at London's O2 Arena. (Photo by Joel Ryan/Invision/AP, File)

Associated Press
FILE - In this Monday, March 4, 2013 file photo, Canadian singer Justin Bieber performs at the O2 Arena in east London.  Bieber is recovering after fainting backstage at a concert in London. A spokeswoman for Bieber said Thursday, March 7, 2013, that the 19-year-old pop star was given oxygen and took a 20-minute reprieve after fainting backstage at London's O2 Arena. (Photo by Joel Ryan/Invision/AP, File)
FILE - In this Monday, March 4, 2013 file photo, Canadian singer Justin Bieber performs at the O2 Arena in east London. Bieber is recovering after fainting backstage at a concert in London. A spokeswoman for Bieber said Thursday, March 7, 2013, that the 19-year-old pop star was given oxygen and took a 20-minute reprieve after fainting backstage at London's O2 Arena. (Photo by Joel Ryan/Invision/AP, File)
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