Music The 12 Best Surprise Celebrity Guests on Taylor Swift's '1989' World Tour By Katie Krause 12:35 PM PST, December 17, 2015 This video is unavailable because we were unable to load a message from our sponsors. If you are using ad-blocking software, please disable it and reload the page. 10:50The 12 Best Surprise Guests on Taylor Swift's '1989' World Tour04:50Garcelle Beauvais ‘On the Fence’ About Returning to ‘RHOBH’ for …02:50'90 Day Fiancé': Ceasar Says He's 'Friends’ With Drake (Exclusiv…03:04'90 Day Fiancé': Sumit Explains How the Tragic Death of His Sist…03:01Ellen Pompeo Recalls Screaming Match With Denzel Washington on '…02:20Katie Couric’s Upcoming Memoir Includes Surprising Confessions00:55Behind the Scenes of Trace Adkins and Luke Bryan’s ‘Where the Co…00:35Natasha Bure and Heather Locklear Deal With Grief in ‘Don’t Swea…03:14‘Never Have I Ever’: Lee Rodriguez Shares Her Hopes For Season 3…01:18Academy Museum of Motion Pictures: H.E.R. & Robert Pattinson Tal…03:15Michael Michele Talks Reimagining ‘Dynasty’s Dominique Deveraux …03:51Britney Spears Has ‘a Lot of Healing to Do’ After Dad’s Suspensi…02:38Watch the ‘90 Day: The Single Life’ Season 2 Explosive Trailer10:55Mark ‘The Undertaker’ Calaway on Retirement and If His Daughter …02:06Jamie Lee Curtis and Kyle Richards on Reuniting in ‘Halloween Ki…01:16'The Neighborhood' Sneak Peek: Dave Is Worried About Gemma After…03:21Adele Speaks Out on Her Divorce and Confirms Relationship With R…01:03Emma Thompson Fondly Remembers Alan Rickman During 'Sense & Sens…12:49‘90 Day Fiancé’: Biniyam Breaks Down In Tears as Ariela Leaves E… Taylor Swift kicked off her 1989 World Tour on May 5, 2015, in Tokyo, Japan – and almost every night thereafter featured some type of magical surprise, a song that wasn’t on the set list – and/or a special celebrity guest. The stage itself became its own palatial spectacle and featured a catwalk where fans got used to seeing some of the world’s biggest stars join the 26-year-old singer. From Justin Timberlake to Nick Jonas and Mick Jagger, these are THE 12 best stars who hit the stage with Taylor – in order of when they appeared. 1. Taylor’s “Squad” Hailee Steinfeld, Lily Aldridge, Gigi Hadid and Lena Dunham (who all happen to be featured in the "Bad Blood" music video) joined Taylor on stage in East Rutherford, NJ on July 10. 2. The WeekndThe pair, who each scored seven Grammy nominations last week, sang a duet of “I Can’t Feel My Face” in East Rutherford, NJ on July 10.RELATED: All of Taylor Swift's 1989 World Tour Guests in L.A. -- Ranked by Randomness 3. Nick Jonas Nick showed up the night after The Weeknd to sing a duet of “Jealous” with Taylor. 4. LordeThe long-time pals sang “Royals” on July 14 in Washington, D.C. 5. Fifth HarmonyTaylor became an honorary member of the girl group on Aug. 14 in Santa Clara, CA. She donned a matching glitzy blue costume and sang “Worth It” alongside Ally, Camilla, Dinah, Lauren and Normani. VIDEO: Taylor Swift and Calvin Harris Celebrate Her Birthday Together -- At a Christmas Bash! 6. Kobe BryantThe Laker legend kicked off Taylor’s five-night stop at the Staples Center on Aug. 21 by presenting her with a special banner to celebrate her record-setting 16 sold-out shows at the arena. 7. Alanis MorissetteTalk about the ultimate break-up songwriter! The rocker queen joined Taylor in L.A. on Aug. 24 and they sang Morissette's “You Oughta Know." 8. Ellen DeGeneresThe daytime talk show host made concert-goers laugh with her sparkly tutu-ensemble as she danced down the catwalk. 9. Lisa KudrowTalk about HILARIOUS. The former Friends star sang “Smelly Cat” with the “Wildest Dreams” singer during her final night at Staples Center on Aug. 26. 10. Selena Gomez Taylor’s BFF showed up on Aug. 26, too. “Swifties” and “Selenators” FREAKED OUT as the long-time besties sang Selena’s hit, “Good For You.”VIDEO: 12 Signs Selena Gomez and Justin Bieber Could Get Back Together in 2016 11. Justin TimberlakeJT was Taylor’s final guest in L.A. – and what a treat! The twosome sang “Mirrors” – and the performance marked his first since becoming a dad in April. 12. Mick Jagger The Rolling Stones frontman joined Taylor in Nashville, TN on Sept. 26 for a performance of the rock band’s song, “(I Can't Get No) Satisfaction.”Taylor’s world tour came to a close last week -- on Dec. 12 in Melbourne, Australia (which was also the day before her 26th birthday). The tour raked in over $250,000,000 dollars and will surely go down in history as one of the most successful of all time. Who was your favorite surprise guest?! Vote in the comment section or on Twitter by sending @Katie_Krause a tweet with the #ETnow hashtag.And speaking of 2015 highlights, check out the video below for all the signs Selena Gomez and Justin Bieber could get back together! 12 Signs Justin Bieber and Selena Gomez Might Get Back Together This video is unavailable because we were unable to load a message from our sponsors. If you are using ad-blocking software, please disable it and reload the page.