Taylor Swift continues to heat up her sold-out “Red Tour” with special guests in each city.

Carly Simon was the latest guest to join Taylor on stage Saturday night at Gilette Stadium in Foxborough, Massachusetts. Carly Simon came on stage to sing her hit “You're So Vain.”

Are you surprised? Taylor writing and performing break up songs – so this is a natural choice for her.

What do YOU think? Did Taylor secretly dedicate the performance to any of her famous exes?

Watch the clip below:

Source: E!