Taylor Swift Performs Fall Out Boy's "My Songs Know What You Did In The Dark" w/ Patrick Stump

Fall Out Boy frontman Patrick Stump joined Taylor Swift on stage last night (July 13th) in New Jersey to perform the band's single, "My Songs Know What You Did In The Dark."

A fan-shot video of the performance can be viewed below.

Don't forget, you can catch Taylor on tour this summer with Ed Sheeran. Remaining dates and ticket information can be found here.