Watch Gwyneth Paltrow “Gleek” Out to Pharrell’s “Happy”

Glee aired its 100th episode on Tuesday night, featuring the return of a number of departed castmembers and former guest stars. But it was Goop goddess Gwyneth Paltrow, reprising her role as substitute teacher Holly Holliday with an infectious performance of Pharrell’s Billboard juggernaut “Happy,” that really stole the show.

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