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Darren Criss' 'Teenage Dream' May Become Most Popular 'Glee' Single Ever

Estimated to sell between 150,000 and 175,000 copies on iTunes, the tunes may soon overtake Journey's "Don't Stop Believin'."

Glee’s cover of Katy Perry’s “Teenage Dream,” featuring guest star Darren Criss, is expected to sell between 150K to 175K downloads its first week on iTunes for the week ending Nov. 14, Billboard reports.