Fall Out Boy's Patrick Stump joined pop singer Taylor Swift at her concert this evening at MetLife Stadium in East Rutherford, NJ, to perform FOB's single “My Songs Know What You Did In The Dark (Light Em Up).”

It it not uncommon for Swift to perform with special guests, however this is her first time hosting Stump at a show. Check out posts about the performance, from both artists:

And here's a full video of the duo performing together:

Much like her love for Paramore and Jimmy Eat World, Swift has long been a vocal fan of Fall Out Boy. Back in the spring, the singer declared her affinity for “My Songs Know…” on Twitter:

And way back 2011, Taylor covered the group's hit “Sugar, We're Going Down,” at a performance in Chicago:

Taylor Swift is currently in the midst of her RED world tour, while Fall Out Boy are gearing up for a tour of Europe and Asia, followed by a North American arena tour in the fall.