1: Taylor Swift's 2009 Fearless Tour featured surprise guests like Kellie Pickler and Justin Bieber.

2: On the Speak Now Tour, Taylor brought out stars like Tim McGraw and Usher to join her on stage.

3: Ed Sheeran and Sam Smith made appearances during Taylor's 1989 World Tour, delighting fans.

4: Taylor Swift's Reputation Stadium Tour included special performances by Shawn Mendes and Selena Gomez.

5: During the Lover Fest shows, Taylor welcomed Halsey and Niall Horan as guest performers.

6: At the Red Tour, Taylor treated audiences to surprise appearances by Jennifer Lopez and Cher Lloyd.

7: The Speak Now World Tour saw guests like Nicki Minaj and Hayley Williams sharing the stage with Taylor.

8: Taylor's Fearless Tour included surprise appearances by John Mayer and Katy Perry, thrilling the crowd.

9: From country stars to pop divas, Taylor Swift's tour guest appearances have created unforgettable moments for fans.