I am a huge fan of Friends. I still watch the reruns every night. It's one of my favorite shows of all-time. But, even if you've never seen one episode of the 90's sitcom, you've probably heard others talking about the show and you definitely know what Smelly Cat is. Some of the best episodes were the ones where Phoebe Buffay would sing "Smelly Cat."

Taylor Swift is a huge Friends fan, too.  She also loves cats, so during  Taylor's final show at the Staples Center in Los Angeles, she invited Lisa Kudrow, who played Phoebe, on stage to sing the song with her.

Taylor introduces her as someone who's played in coffee houses. Lisa even stops to give Taylor some advice during the song.

Taylor sold-out five nights at the Staples Center.  Each night she welcomed several guests on stage with her including, Mary J. Blige, Alanis Morissette, Justin Timberlake and Selena Gomez.

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