Watch: Fans go crazy when Taylor Swift sings 'Smelly Cat' with Phoebe Buffay

Taylor Swift surprises her fans and the many, many, many Friends fans around the world by inviting Phoebe Buffay, aka Lisa Kudrow to sing that famous hit from the show Smelly Cat, during her fifth show at the Staples Centre.

In the video posted on Youtube, concert-goers sang along with Kudrow and Taylor, remembering every word. However, in true Pheobe fashion, she stopped in the middle to give Swift some tips on belting out the song.

Kudrow took to Twitter to share her excitement about the performance.

So @taylorswift13 is THE best person I've ever met. That was fun. Thanks Taylor.

— Lisa Kudrow (@LisaKudrow) August 27, 2015

For pure nostalgia, check out Buffay "singing" Smelly Cat on Friends.

Seems like Swift's fans are loving all the Friend's surprises. Just recently Matt Le Blanc also made an appearance during one of her shows.

Also Watch: Taylor Swift shares sneak peak of new music video 'Wildest Dreams' on Instagram