Continuing her run of inviting surprise guests to join her onstage during her current tour, Taylor Swift performed duets Wednesday night with Selena Gomez and Justin Timberlake.
But it was her ode to an odoriferous cat that had everybody talking.
Midway through her set at Los Angeles' Staples Center, Swift brought out actress Lisa Kudrow for a loose rendition of "Smelly Cat," the song Kudrow's ditsy Phoebe character famously sang on "Friends."
The audience erupted in cheers and laughter as the two women strummed acoustic guitars while singing the brief ditty, which starts out, "Smelly cat, smelly cat -- what are they feeding you?"
Midway through the song Kudrow interrupted Swift to "criticize" her singing, telling her, "I'm sorry. That was good, but you have to really feel the lyrics."