Billy Joel surprised fans at Madison Square Garden earlier this week with an appearance by superstar Olivia Rodrigo. Olivia performed her hit "Deja Vu" before the duo launched into "Uptown Girl."
Billy & Joel "Uptown Girl" and then followed up with her hit "Deja Vu" -- a song where she name-drops Billy.
You can watch some fan videos of the performance below!
Photo Credit: Getty