Alexander Tamargo/Getty Images

The duo also teamed up to perform Ed's 'Thinking Out Loud.'

Ed Sheeran’s buddy Taylor Swift may get all the props for her stellar, exhaustive lineup of celebrities who crash her 1989 Tour concerts on the regular. But the “Lay It All On Me” crooner gave Tay a run for her money on Friday night (Sept. 25) when he surprised the crowd at Boston’s Gillette Stadium with a very special guest: Chris Martin.

The Coldplay frontman joined Sheeran onstage for two duets, much to the sold-out crowd’s roaring approval. First up, the pair tackled Sheeran’s sweet serenade “Thinking Out Loud.”

Then, they launched into Coldplay’s lovey-dovey gem “Yellow” (you know, the song that reminds Jay Z of Beyoncé), seamlessly harmonizing for a truly magical performance.

Among the crowd of lucky concertgoers who got to witness the Brits’ duets were Martin’s ex Gwyneth Paltrow and their two children, Apple and Moses. Paltrow shared a sweet snap from the show, writing, “Baby daddy in a sweet duet with the immensely talented. #edsheeran #yellow.”

Sheeran later thanked his duet partner for joining him onstage, calling it as we all saw it: “Epic.”