We all know Taylor Swift's got a lot of famous friends - but now she's really proved it.
On her 1989 tour, Swift has been joined on stage by a different "special guest" each night - and the roster of stars is starting to get a bit weirder.
Last night, Swift was joined on stage by Lisa Kudrow - also known as Phoebe Buffay from 90s sitcom Friends - and the pair presented a soulful rendition of a familiar tune.
You guessed, it - Smelly Cat. First featured on the episode The One With The Baby On The Bus, Phoebe's acoustic anthem echoed throughout the whole series.
However, it's a whole new - and slightly surreal - experience to see it performed with pop royalty in front of a huge stadium audience.