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I'd like to welcome to the stage....

Taylor Swift performed her final LA concert at Staples Center on Wednesday night, and in true T-Swizz form, she treated to the crowd to surprise guests Selena Gomez, Justin Timberlake, and Lisa Kudrow. Now you might be wondering why the Friends star hit the stage, but it makes total sense! The Grammy winner is a huge fan of the 90s sitcom, and the actress performed her character Phoebe's hit tune "Smelly Cat" for the sold out audience.

Selena, meanwhile, gave us an embarrassing rendition of her song "Good For You," and even though Tay Tay tried to help out and sing along, it still sounded terrible.

JT brought the house down by dueting with Calvin Harris' lady love on his hit "Mirrors," and his wife Jessica Biel cheered from the crowd. "Jessica was clapping a ton and singing along to Justin's performance. She was clearly loving it!" a source dished to Us Weekly.

She might be pals with pretty much all of Hollywood, but we are pretty confident Justin Bieber will never be invited to join in!