Menzel wore a dress reminiscent of Elsa's glistening blue gown and Swift dressed up as the lovable snowman Olaf while performing in Tampa, Fla. at the last show of Swift's U.S. tour on Saturday. Menzel belted out the first few lyrics of the hit song she originally performed for the movie until the two took off their costumes and Swift joined in to finish the number.
"Frozen totally happened tonight. And 55,000 people sang 'Let It Go' so loudly, it nearly took my breath away," Swift wrote on Instagram.
Swift later tweeted about the Frozen sing-a-long.
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