FILE - This July 28, 2013 file photo shows singer Katy Perry at the world premiere of "The Smurfs 2" in Los Angeles. Perry will be the final act of the month-long London festival. It kicks off Sept. 1 with another diva, Lady Gaga, and will feature Robin Thicke, Elton John, Justin Timberlake, John Legend, Kendrick Lamar and the Kings of Leon, among others. (Photo by Jordan Strauss/Invision/AP, File)

Associated Press
FILE - This July 28, 2013 file photo shows singer Katy Perry at the world premiere of "The Smurfs 2" in Los Angeles. Perry will be the final act of the month-long London festival. It kicks off Sept. 1 with another diva, Lady Gaga, and will feature Robin Thicke, Elton John, Justin Timberlake, John Legend, Kendrick Lamar and the Kings of Leon, among others. (Photo by Jordan Strauss/Invision/AP, File)
FILE - This July 28, 2013 file photo shows singer Katy Perry at the world premiere of "The Smurfs 2" in Los Angeles. Perry will be the final act of the month-long London festival. It kicks off Sept. 1 with another diva, Lady Gaga, and will feature Robin Thicke, Elton John, Justin Timberlake, John Legend, Kendrick Lamar and the Kings of Leon, among others. (Photo by Jordan Strauss/Invision/AP, File)
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