Katy Perry Reacts To Darren Criss' 'Teenage Dream' Performance On 'Glee': 'He's Amazing'

Katy Perry chats with Access at the launch event for her new scent, "Purr," about what she thought of Darren Criss singing "Teenage Dream" on "Glee." Does she like it when people take a song of hers and make it their own?

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