Taylor Swift just finished her 1989 album tour in the US, and she knew she had to go out with a bang. But what would be the best way to surprise her audience on Halloween?

Well, she totes brought Idina Menzel (the voice of Elsa from Frozen) on stage and they both sang “Let It Go” together!

And the best part?

Tay got dressed up as Olaf!

Did you know that Taylor is coming to Australia? She’ll be performing in Sydney, Brisbane, Adelaide and Melbourne and we’re sooo excited!

Which song would you love to see Taylor sing live, TGs? Tell us in the comments below!