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Gleeks went nuts for the Madonna episode last season (more than 13.5 million people tuned in) and now the cult show’s producers are plotting a Britney Spears episode. Sprightly Cheerio, Brittany (Heather Morris), will be singing two of Spears’s biggest hits, which are yet to be announced. Our guess? The high school-set “Hit Me Baby One More Time,” complete with plaid skirts, pigtails, knee socks and midriffs!