Taylor Swift saved her most chilling celebrity duet of the year for Halloween.
Dressed as Olaf
the snowman from Disney's "Frozen," the pop star brought actress Idina
Menzel onstage at her Tampa, Fla. concert to sing the animated
blockbuster's trademark song, "Let It Go."
Swift surprised concertgoers when she disappeared backstage, only to
quickly reemerge in her Olaf costume. Her background dancers, meanwhile,
donned reindeer outfits as the singer addressed the crowd.
