It’s always wonderful to see celebrities work together on stage, and Taylor Swift’s 1989 World Tour at the Staples Center in Los Angeles on August 26, 2015, was no exception. When Lisa Kudrow, star of “Friends,” unexpectedly and humorously joined Swift on stage, fans were in for a delightful surprise.

Taylor Swift teased the crowd about her special guest during the sold-out show, hinting that it would be someone who has only ever performed in coffee shops. As Swift got the audience ready for the guest’s major venue debut, there was a tangible sense of excitement in the air.

When the audience discovered Lisa Kudrow—better known for her role as Phoebe Buffay on “Friends”—was the surprise visitor, they let out a whoop and cackled. The night’s high point was a rare and sentimental surprise for the audience: a live acoustic performance of the classic “Friends” song “Smelly Cat.”

Watch the video below to witness Taylor Swift and Lisa Kudrow’s distinctive and enjoyable rendition of “Smelly Cat” from the 1989 World Tour.