Taylor Swift has welcomed pretty much every celebrity to her 1989 world tour stage, and on the final night of shows in Los Angeles, she really upped her game! First, Selena Gomez came out for her first ever live performance of GOOD FOR YOU. Then Justin Timberlake came out to perform MIRRORS, but it seems like the biggest surprise of the night was when Lisa Kudro from FRIENDS joined Taylor to sing SMELLY CAT!!! The crowd LOST IT!