Credit: Kevin Mazur/LP5/WireImage

Good luck recovering from Taylor Swift’s two-night run at MetLife Stadium. Appearances from The Weeknd, the U.S. Women’s National Soccer Team and her “Bad Blood” squad left fans reeling, but one guest performer got Swift all sentimental.

On Saturday night, she brought out Nick Jonas to perform his hit song, “Jealous.” Jonas and Swift have known each other for years, and back in 2009 she performed “Should’ve Said No,” off her 2008 self-titled debut album, in the Jonas Brothers’ concert movie, Jonas Brothers: The 3D Concert Experience. On Sunday, Swift posted a throwback photo from that performance next to one from Saturday’s, igniting all the feels.

How time flies when you’re ruling the world.