It seems like every day this week a story has popped up on my newsfeed about the latest celebrity that Taylor Swift has surprised her fans with by bringing on stage for some fun. This is nothing new for Taylor, who often brings celebrity friends up to sing with her whenever she can. Here’s a list of the most surprising celebrities that T.Swift has had grace the stage with her during her 1989 world tour.

Taylor Swift

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Julia Roberts and Joan Baez
Julia Roberts might be well known because she’s one of the most successful actresses in Hollywood, but it was still a bit of a shock to see her strut out on stage at Taylor’s Santa Clara show on August 15th. Even more surprising was who she had at her side, legendary folk singer Joan Baez, who danced along with Julia and Taylor despite her 74 years of age.

Lisa Kudrow
Half of Taylor’s fans might not have even been born when the smash hit Friends began its amazing run back in 1994. That didn’t stop the internet from freaking out when news that Lisa Kudrow—in character as the eccentric Phoebe Buffay—joined Taylor onstage at LA’s Staples Center. The duo performed the fan-favorite “Smelly Cat,” which was a running gag on the NBC show. Kudrow might have been a random  guest, but she certainly was an entertaining one.

Nico & Vinz
Who? Nico & Vinz are a singing and songwriting duo from Norway, and while you might not recognize their name, you’ll probably recognize their hit song “Am I Wrong.” The duo surprise Taylor’s audience in Vancouver at the beginning of August, and Taylor joined them in an energetic rendition of their hit song.

Uzo Aduba
The Emmy-nominated Orange Is The New Black actress might seem like a random choice, but Taylor must have thought it made a lot of sense, because Uzo joined Taylor not once, but twice! Uzo’s first surprise appearance was back in July where she graced the stage in New Jersey with a slew of supermodels, and then she not only joined Taylor on stage again in LA, she sang a duet with her! Who knew Crazy Eyes had a crazy voice like that!