Taylor Swift's best 1989 world tour surprise guests

Taylor Swift’s 1989 world tour has seen a who’s who of the world’s top talent take the stage alongside the beloved singer – and fans have delighted in seeing which surprise guests would join Taylor each night. In honour of the singer's final show in Melbourne on Dec. 12, Hello! looks back on the incredible journey Taylor shared with her famous friends and beloved fans.

TAP THE IMAGE FOR THE BEST MOMENTS FROM TAYLOR'S TOURKeith Urban surprised audiences on night 1 in Toronto.

Descending on Toronto for two nights on Oct. 2 and Oct. 3, Taylor surprised fans with a pyro-fuelled performance with country star Keith Urban. The pair performed two songs, "John Cougar, John Deere, John 3:16" and "Somebody Like You."

On Sept. 26 the pop star introduced her Nashville audience to one of music's living legends, Mick Jagger (and made this grandma's dreams come true!). The two performed satisfaction, and Taylor also duetted 'Bleeding Love' with Leona Lewis.

TAP THE PHOTO TO SEE ALL OF TAYLOR'S SURPRISE GUESTS:The audience went wild when Rolling Stone Mick Jagger took the stage.

This star-studded performance came one day after the singer brought Steven Tyler on stage to belt out 'I Don't Want to Miss a Thing.' And on Aug. 29, the audience at Petco Park in San Diego were treated to a very special duet between Taylor and Canada's own Avril Lavigne. The top selling artists rocked out during a performance of Avril's hit song, 'Complicated.'

During Taylor's show at LA's Staples Center on Aug. 24, talk show queen Ellen DeGeneres worked the stage in a glittery silver body suit during a performance of Taylor's hit song 'Style.' Also, Canadian songstress Alanis Morissette surprised the sell-out crowd when she took to the stage to perform a duet of her breakup anthem 'You Oughta Know.' "I think it’s fair to say that so many of the female singer-songwriters of my generation, including myself, would not write the way that we do without her and her music," gushed Taylor.

From Julia Roberts to Cara Delevingne, A-listers to accept the honour hail from the worlds of film, music and fashion, proving the pop star’s wide-reaching popularity.

While the Shake it Off singer has yet to collaborate on stage with her boyfriend Calvin Harris, she has enlisted the supported of her “squad” on several occasions, including models Karlie Kloss, Gigi Hadid and Martha Hunt. The top models all starred in Taylor’s record breaking Bad Blood music video, and like Ellen, have been strutting their stuff on stage to her single Style.

CLICK ON PHOTOS FOR GALLERY Taylor Swift was joined on stage by Canadian singer Alanis Morissette in Los Angeles.

On one such occasion they were joined by Girls star Lena Dunham who has since joked: “I don’t think standing next to, like, three supermodels or so is anything even the most confident woman needs to do.”

The list of famous faces doesn’t stop there though; Taylor has most recently performed with girl groups Fifth Harmony and Little Mix, and expressed her support for the British girl group by saying that they “smashed it” performing their number one track Black Magic.

Taylor’s “squad” have joined her on tour on several occasions

Taylor has also proved that her popularity surpasses the pop world after she was joined by R&B star Ciara and her boyfriend Russell Wilson, as well as rapper Fetty Wap and the man responsible for her “fave summer jam”, Jason Derulo.

The 25-year-old recently told ITV’s Lorraine that it’s “fun to have special guest appearances on stage even if they’re not musical guests,” and Taylor proved that on Saturday night when she brought out her “heroes” Julia Roberts and Joan Baez in front of the crowd at Santa Clara.

Taylor’s heroes Julia Roberts and Joan Baez take to the stage

“Tonight Joan Baez and Julia Roberts danced it out to ‘Style’. These two women are my heroes. What an honor,” she later shared on Instagram.

Click on the photos to see some of Taylor Swift’s best supporting acts from her 1989 world tour.

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