Taylor Swift Covers 'Smelly Cat' With Lisa Kudrow

The two performed the "Friends" classic.

— -- Well, we didn't find out what they are feeding "Smelly Cat," but better yet, Taylor Swift performed the classic hit Wednesday night with "Friends" star Lisa Kudrow.

And it was glorious!

"She's only ever played in coffee houses," Swift joked, as she welcomed Kudrow to the stage for her “1989” world tour.

Then Kudrow, acting as her character Phoebe Buffay, performed the song with Swift.

Check it out below: