Actor Cory Monteith, who plays Finn Hudson
on 'Glee,' Tweeted
a photo of Glee's co-creator and director Brad Falchuk on set of Britney's special episode.
If you look closely, you can see Glee actress Lea Michele in a "Baby One More Time" outfit (as well as sitting on the stands [check the monitor]).
And if that's not proof enough, check out a paparazzi photo of Lea in costume:
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