Fall Out Boy’s Patrick Stump Joins Taylor Swift Onstage to Sing ‘My Songs Know What You Did In The Dark’ [VIDEO]

Taylor Swift is no stranger to having fellow singers on stage at her concerts. Hometown heroes when available, or just singing a song based in the area. Well, T-Swizzle had FOB's Patrick Stump jump onstage and sing their most recent single, "My Songs Know What You Did in the Dark (Light 'em up!)."

See the performance here.