Lisa Kudrow

Kudrow sings Smelly Cat with Swift on stage at Staples Center, Los Angeles.

This singer has only ever played in coffee houses before. She never played in a big venue like this. Please make her feel welcome. You guys, her name is Phoebe Buffay.

At one point, Kudrow stops the performance to give Swift advice:

You have to really feel the lyrics, you know

Who doesn't love a little "Smelly Cat"?!?! #1989TourLA #Friends @LisaKudrow @taylorswift13 pic.twitter.com/7m07TAomv6

— Crypto.com Arena (@cryptocomarena) August 27, 2015