FILE - This Nov. 22, 2011 file photo shows singer Taylor Swift performing at Madison Square Garden in New York. Swift will be among many top performers at the iHeartRadio Music Festival in Las Vegas this weekend. The two-day festival at the MGM Grand features an A-List lineup of stars including Swift, Aerosmith, Rihanna, Usher, Bon Jovi, Lil Wayne, and Green Day. (AP Photo/Charles Sykes, file)

Associated Press
FILE - This Nov. 22, 2011 file photo shows singer Taylor Swift performing at Madison Square Garden in New York. Swift will be among many top performers at the iHeartRadio Music Festival in Las Vegas this weekend. The two-day festival at the MGM Grand features an A-List lineup of stars including Swift, Aerosmith, Rihanna, Usher, Bon Jovi, Lil Wayne, and Green Day. (AP Photo/Charles Sykes, file)
FILE - This Nov. 22, 2011 file photo shows singer Taylor Swift performing at Madison Square Garden in New York. Swift will be among many top performers at the iHeartRadio Music Festival in Las Vegas this weekend. The two-day festival at the MGM Grand features an A-List lineup of stars including Swift, Aerosmith, Rihanna, Usher, Bon Jovi, Lil Wayne, and Green Day. (AP Photo/Charles Sykes, file)
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