The singer came on as the snowman Olaf of Frozen to sing Design through the final US concert of her 1989 world tour.
Supporters afterward surprised by bringing on Idina Menzel to sing Let It Go together with her.
“I just wish that Idina Menzel was here, dressed as Elsa to sing Let It Go,” Taylor teased the audience.
“It’s a good thing she is, Tampa!”
The pair whipped off their Frozen ensembles after the famous line “The cold never bothered me anyway”.
Before the Tampa show, Taylor appeared to get fairly emotional.
Her Olaf snowman costume had some similarities to the Teletubby ensemble Taylor wore at Halloween as a young child.
Getting her buddies on for a duet is getting a little matter for Taylor during the 1989 tour.
Before moving on to Australia her 1989 tour continues in China and Singapore.