Taylor Swift's celebrity guests during her '1989' tour

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An Olaf-clad Taylor Swift was joined on stage by Idina Menzel in Tampa, Florida, where the two belted out the 'Frozen' hit "Let It Go." Photo: Getty Images

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Taylor Swift invited rising singer Alessia Cara to the "1989" stage on Halloween in Tampa, Florida. Photo: Getty Images

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Taylor lived la vida loca with Ricky Martin on stage in Miami. Photo: Getty Images

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Heat Nation! Taylor Swift invited Miami Heat's Dwyane Wade up on stage where the athlete gave her a number 13 jersey. Photo: Getty Images

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Taylor Swift and Mr. 305 turned Mr. Worldwide Pitbull on stage at American Airlines in Miami. Photo: Getty Images

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Taylor remembered her roots as she asked country singer Miranda Lambert to join her on stage to sing. Together the pair belted out Miranda's hit tune "Little Red Wagon." Photo: Getty Images

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In October 2015, Taylor was excited by Ms. Goulding's appearance in Arlington; 'Ellie killed it tonight in TX!!!' @elliegoulding Photo: Instagram/@taylorswift

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Boom clap! Taylor Swift performed with Charli XCX for the second night in Toronto. Photo: Getty Images

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Keith Urban joined the pop princess as she rocked in Toronto, Canada. Photo: Getty Images

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Taylor along with HAIM played backup singers to Nelly in St. Louis, Missouri. Photo: Getty Images

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Mick Jagger! Taylor had the Rolling Stones front man surprise guests during her second night in Nashville. Photo: Getty Images

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Leona Lewis belted out her hit "Bleeding Love" with Taylor in Nashville. Photo: Getty Images

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Walk this way! Steven Tyler joined Taylor on stage in Nashville where the two sang "I Don't Want to Miss a Thing." Photo: Getty Images

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Taylor asked Kelsea Ballerini to be her little sister on Instagram after the two performed for the sold out crowd in Nashville. Photo: Getty Images

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Taylor had country artist Dierks Bentley join her in Kansas City, Missouri. Photo: Getty Images

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Taylor and Wiz Khalifa entertained the sold out crowd in Houston. Photo: Getty Images

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Omi and Taylor coordinated their outfits and performed together for the "Shake It Off" singer's San Diego performance. Photo: Getty Images

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Taylor rocked out with Avril Lavigne at her show in San Diego. Photo: Getty Images

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Taylor was joined by BFF Selena Gomez in similar outfits. The singer captioned wrote along with a photo of the two: "Sisterhood." Photo: Getty Images

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Justin Timberlake, who has been enjoying time at home with his baby boy Silas, joined Taylor and thousands of screaming fans. Photo: Getty Images

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Smelly Cat, Smelly Cat... Lisa Kudrow performed her hit song from 'Friends' with Taylor Swift. Photo: Getty Images

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Taylor and John Legend performed a version of "All of Me" together. Photo: Getty Images

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Taylor admitted it was a dream performing with Beck and St. Vincent. Photo: Getty Images

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Taylor performed with Alanis Morissette at her sold-out show at the Staples Center in Los Angeles. Photo: Getty Images

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Taylor performed with Dixie Chix's Natalie Maines. Photo: Getty Images

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Ellen DeGeneres walked the catwalk wearing a sequin outfit. Photo: Getty Images

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Matt Leblanc, Chris Rock and model Sean O'Pry joined Taylor Swift on stage during her concert at the Staples Center in L.A. Photo: Getty Images

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Mary J. Blige hugged Taylor Swift on stage during the "Shake It Off" singer's Los Angeles concert. Photo: Getty Images

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'Orange is the New Black's' Uzo Aduba sang with Taylor at her L.A. concert. Photo: Getty Images

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Taylor Swift was honored to have Julia Roberts and Joan Baez strut the "1989" tour stage with her. Photo: Instagram/@taylorswift

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Taylor Swift and Little Mix treated the audience to a performance of "Black Magic." Photo: Instagram/@taylorswift

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Taylor Swift and Fifth Harmony surprised fans with a performance of "Worth It." Photo: Instagram/@taylorswift

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Ciara joined Taylor on stage and dance along with the pop star on the "1989" tour. Photo: Instagram/@taylorswift

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Taylor brought out rapper Fetty Wap to sing his hit single and one of her favorite songs, "Trap Queen." Photo: Instagram/@taylorswift

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Nico and Vinz offered support and performed their hit "Am I Wrong." Photo: Instagram/@taylorswift

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Taylor and Walk the Moon kept the crowd on their feet with their performance of "Shut Up and Dance." Photo: Instagram/@taylorswift

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Taylor and Serayah performed "Style." Photo: Instagram/@taylorswift

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Jason Derulo treated the audience to at steamy performance of "Want to Want Me." Photo: Instagram/@taylorswift

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Taylor and BFF Lorde surprised the audience with a performance of "Royals." Photo: Instagram/@taylorswift

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Lily Aldridge, Candice Swanepoel, Martha Hunt, Uzo Aduba, Karlie Kloss, Behati Prinsloo and Gigi Hadid strutted the runway with the pop star. Photo: Instagram/@taylorswift