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Britney Spears

AP

In this publicity image released by Fox, pop singer Britney Spears, left, and Heather Morris are shown on the set of "Glee" for the "Britney Britney" episode airing, Tuesday, Sept. 28, 2010 at 8:00 p.m. EST on Fox. (AP Photo/Fox, Adam Rose)In this publicity image released by Fox, pop singer Britney Spears, left, and Heather Morris are shown on the set of "Glee" for the "Britney Britney" episode airing, Tuesday, Sept. 28, 2010 at 8:00 p.m. EST on Fox. (AP Photo/Fox, Adam Rose)

In this publicity image released by Fox, pop singer Britney Spears, left, and Heather Morris are shown on the set of "Glee" for the "Britney Britney" episode airing, Tuesday, Sept. 28, 2010 at 8:00 p.m. EST on Fox. (AP Photo/Fox, Adam Rose)