FILE - In this Oct. 5, 2011 file photo, singer Rihanna performs 

FILE - In this Oct. 5, 2011 file photo, singer Rihanna performs at the o2 arena in east London, as part of her 2011 "Loud" tour. Rihanna has topped the charts with a number of dance-flavored gems, from “We Found Love” to “Only Girl (In the World)” to "S&M." (AP Photo/Joel Ryan, file)
Associated Press
FILE - In this Oct. 5, 2011 file photo, singer Rihanna performs at the o2 arena in east London, as part of her 2011 "Loud" tour. Rihanna has topped the charts with a number of dance-flavored gems, from “We Found Love” to “Only Girl (In the World)” to "S&M." (AP Photo/Joel Ryan, file)
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