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Brittany (S. Pierce) is played by Heather Morris.

… Her big break came in 2007 via Beyoncé. Morris was one of Beyoncé’s backup dancers on The Beyoncé Experience world tour …

Morris was taking acting classes and actively pursuing an acting career when she was asked … to teach the choreography for Beyoncé’s “Single Ladies” dance to the Glee actors. At the same time, the show was looking for a third cheerleader, and Morris ended up landing the role of Brittany.

Initially a background character who hardly ever spoke, the role grew as writers discovered Morris had a gift for delivering one-liners …