Taylor Swift and Idina Menzel duet "Let It Go"

In her grand tradition of inviting guests to sing with her on tour, Taylor Swift once again slayed her Halloween live show by inviting Broadway star Idina Menzel on stage with her to duet “Let It Go”. Taylor and Idina not only sang the iconic Frozen together, they also wore themed costumes!

Frozen totally happened tonight. And 55,000 people sang 'Let it Go' so loudly, it nearly took my breath away. Good times, @idinamenzel ?

A photo posted by Taylor Swift (@taylorswift) on Nov 1, 2015 at 1:14am PST

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Taylor appeared as everyone's favorite snowman Olaf and Idina wore Elsa's gorgeous sparkly blue ice queen outfit. Idina was the voice of Elsa in Disney's animated hit Frozen, so it's totally awesome to see her bring the character to life by wearing the dress on stage.

Happy Halloween!

A video posted by Taylor Swift (@taylorswift) on Oct 31, 2015 at 10:24pm PDT

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Taylor shared these photos and video clips on her Instagram right after their Halloween performance. You've never heard “Let It Go” quite like this before!

“The cold never bothered me anyway.” QUICK CHANGE @idinamenzel

A video posted by Taylor Swift (@taylorswift) on Oct 31, 2015 at 10:23pm PDT

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Taylor Swift is currently on a world tour for her hit album “1989”.

Taylor Swift and Idina Menzel duet to “Let It Go”