Darren Criss joined his Glee co-star Demi Lovato onstage at Toronto's We Day festival for a duet of her hit Skyscraper. The couple was backed by a boys' choir.
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Everyone knows what Miranda Cosgrove is up to, but what about Spazzy McGee?
Not everyone is making appearances on 'Girl Meets World'.
These celebs prove T. Swift doesn’t have the monopoly on famous pals.