For Swift's first L.A. show, the Friends alum, comedian and "Blank Space" star were the show's guests.
Wearing a gorgeous sparkly gown, Taylor helped Legend perform "All of Me," the love song he wrote about his wife.
Honey, she's good! Andy Grammer performed his new hit song when Taylor hit the Windy City.
During her Washington, D.C. show, a shirtless Derulo surprised fans with a sexy performance of "Want to Want Me."
For one of her New Jersey shows, Taylor's special guest brought the house down with the hit song "Can't Feel My Face."
The Orange Is the New Black star joined Swift onstage to duet to her hit "White Horse."
Oh, how times have changed! Nick Jonas joined Swift onstage for a "Jealous" duet years after she was the celeb cameo on the Jonas Brothers tour.
Olivia's namesake takes the stage! The Law & Order: SVU star paid a visit to Taylor's show with the Paper Towns actress.
The R&B singer was brought onstage in Los Angeles to perform her 2001 hit "Family Affair."
Two new members joined Taylor's squad during her Santa Clara stop as the actress and folk singer danced it out to "Style."
The NBA supertar surprised Taylor with a banner that celebrated her record breaking run of sold-out shows at the Staples Center.
The Empire star and one of Taylor's "Bad Blood" badasses hit the stage during her Chicago show.
The Seattle Seahawks quarterback and his leading lady showed they were ecstatic to be part of Taylor's cameo club.
Taylor brought out the country crooner in Chicago so they could duet to his single "Take Your Time."
Candice Swanepoel, Behati Prinsloo and more of Taylor's model pals joined Orange Is the New Black's Uzo Aduba onstage at MetLife Stadium in New Jersey.
Swift matched the ladies in blue as they performed their hit song "Worth It."
Taylor's model BFFs had no problem rocking the catwalk during her Detroit concert.
Taylor invited the One Republic frontman to duet to the anthem "Counting Stars."