Taylor Swift, Lisa Kudrow 1989 Tour 'Friends' "Smelly Cat" Sing-A-Long [WATCH]

Taylor Swift's latest video might just be the greatest thing we never knew that we needed. No, we aren't talking about the video for her upcoming single, "Wildest Dreams"- even though that is expected to be released any day now- instead we are talking about the video of what happened during her last show in Los Angeles. The "Bad Blood" singer is known for bringing random stars onto the stage at her concerts, but we think that her latest stage addition might just be our favorite one yet. During her 1989 Tour, she called Lisa Kudrow to the stage to perform a version of "Smelly Cat" from TV shows Friends.

In the YouTube clip, Kudrow, who played Phoebe Buffay for ten seasons on the NBC hit, joins Swift onstage for the once in a lifetime performance of the always-catchy song.

"She's only ever played in coffee houses before," the singer teased of Kudrow's TV character. "She's never played in a big venue like this."

Kudrow even referenced one of the episodes of the show while onstage, as she interrupted Taylor mid-performance to tell her, "You have to really feel the lyrics."

It wasn't just Kudrow who was called onstage at the venue. Also Swift's bestie Selena Gomez joined the starlet for a rendition of her latest hit, "Good For You."

The "Blank Space" singer also took to her Twitter to post some pictures of special guest Justin Timberlake who joined her onstage for a duet on his single "Mirrors" from his The 20/20 Experience album.

One of the pictures that she posted shows Timberlake "mid-mic drop," as she wrote in the caption on the social media site.

According to Variety, some of the other famous faces that have joined her onstage have included Mary J. Blige, John Legend, Alanis Morissette, Ellen DeGeneres, and Kobe Bryant.