Taylor Swift's best 1989 world tour surprise guests

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Brit dance queen Charli XCX joined Taylor on stage for night two in Toronto on Oct. 3, where the two performed "Boom Clap." Photo: Getty Images
Keith Urban joined Taylor for a pyro-tastic two songs during her first stop in Toronto. Photo: Getty Images
The world went wild over news that Rolling Stone Mick Jagger popped up to duet one of his band's greatest hits, 'Satisfaction.' Photo: © Getty Images
Taylor and Leona Lewis sang 'Bleeding Love' to a sold-out crowd in Nashville on Sept. 26, the same night that Mick Jagger took the stage. Photo: © Getty Images
Not wanting to miss out on the action, Steven Tyler joined the pop star at a Nashville show to sing 'I Don't Want to Miss a Thing." Photo: © Getty Images
Taylor brought Wiz Khalifa on stage to sing 'See You Again' in Houston on Sept. 9. Photo: © Getty Images
Avril Lavigne performed her hit song, 'Complicated,' in San Diego. Photo: © Twitter
Selena Gomez: "Sisterhood. @selenagomez #1989TourLA". Photo: © Getty Images
Taylor performed "Smelly Cat" with the former 'Friends' star. Photo: © Getty Images
Justin Timberlake: Justin Timberlake. Mid-mic drop. #1989TourLA Photo: © Getty Images
Cara Delevingne and Mariska Hargitay: "Couldn't even contain my happiness because @caradelevingne and @therealmariskahargitay surprised the crowd tonight. #1989TourPhilly". Photo: © Instagram
St. Vincent and Beck: "St. Vincent casually slaying that guitar solo while pyro goes off in the background. Beck and I having a dance party. I don't know how to process any of the events of tonight." Photo: © Getty Images
Uzo Aduba: "I'm so blown away by the multi-talented Uzo Aduba and how she smashed "White Horse" tonight. And also by how incredibly down to earth and wonderfully kind she is." Photo: © Instagram
Dixie Chicks' Natalie Maines takes to the stage in LA. Photo © Getty Images
Taylor is usually surrounded by her girls, but in LA, the singer welcomed actors Matt LeBlanc and Chris Rock, and model Sean O'Pry. Photo © Getty Images
Funny lady Ellen DeGeneres struts her stuff during 'Style' in LA. Photo © Getty Images
The Queen of R&B, Mary J. Blige, blows the roof off the Staples Center. Photo © Getty Images
Alanis Morissette performed a special duet of her hit song 'You Oughta Know.' Photo © Getty Images
Julia Roberts and Joan Baez: "Tonight Joan Baez and Julia Roberts danced it out to 'Style'. These two women are my heroes. What an honor." Photo: © Instagram
Little Mix: "Little Mix smashed it in front of 50,000 screaming fans tonight! #1989tourSantaClara." Photo: © Instagram
Fifth Harmony: "So stoked this pic exists because this was SO MUCH FUN @FifthHarmony". Photo: © Instagram
Ciara: "Can't even describe how happy I was when this was taken. Thank you again @Ciara for being so magical." Photo: © Instagram
Fetty Wap: "Unable to find my chill because of @fettywap1738 singing 'Trap Queen' for 60,000 people in Seattle. Amazing night!!" Photo: © Instagram
Ciara and Russell Wilson: "That Seattle crowd went ABSOLUTELY INSANE when @ciara and @dangerusswilson walked out!! I LOVED TONIGHT." Photo: © Instagram
Nico and Vinz: "I am OBSESSED with @nicoandvinz and so was that Vancouver stadium crowd!! They are absolutely dynamic performers, the most down to earth guys, and Am I Wrong is such a brilliant song. SO HAPPY TONIGHT and so in awe of great artists like this." Photo: © Instagram
Walk The Moon: "Thanks @WALKTHEMOONband for surprising the Boston crowd with 'Shut Up and Dance'!!! 60,000 person dance party." Photo: © Instagram
Serayah: "Later on, when @serayah slayed it on stage singing 'Style' with me at Soldier Field in Chicago...." Photo: © Instagram
Jason Derulo: "I got to sing my fav summer JAM 'Want To Want Me' with @jasonderulo in DC- I'm also loving his new single 'Cheyenne'!" Photo: © Instagram
Lorde: "When your friend flies across the world to surprise your crowd with 'Royals' because she's a wondrous angel. @lordemusic." Photo: © Instagram
Candice Swanepoel, Lily Aldridge, Martha Hunt, Uzo Aduba, Karlie Kloss, Behati Prinsloo and Gigi Hadid: "I ADORE THESE GIRLS. @angelcandices @lilyaldridge @marhunt @uzoaduba @karliekloss @behatiprinsloo @gigihadid." Photo: © Instagram
Nick Jonas: "Last night the incredible @nickjonas sang 'Jealous' and 60,000 people sang it with us/screamed uncontrollably." Photo: © Instagram
Hailee Steinfeld, Lily Aldridge, Gigi Hadid, Lena Dunham: "The Trinity, Frostbyte, Slay-Z, and Lucky Fiori brought the Bad Blood video to life tonight at #1989TourEastRutherford." Photo: © Instagram
US Women's football team: "Got to welcome the U.S. Women's Soccer Team home after their World Cup Victory- I LOVE THEM AND THEY ARE THE NICEST." Photo: © Instagram
The Weeknd: "I was so honored to share the stage with The Weeknd tonight! @abelxo #1989TourEastRutherford". Photo: © Instagram
Cara Delevingne, Kendall Jenner, Gigi Hadid, Martha Hunt, Serena Williams and Karlie Kloss: "The squad in London. @caradelevingne @kendalljenner @gigihadid @marhunt @serenawilliams @karliekloss". Photo: © Instagram
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