UPDATE: Shortly after the co-writing news broke, Calvin Harris went off on a mini Twitter rant about the "hurtful" way this revelation was made.
Calvin Harris and Taylor Swift may be over, but TSwift's influence on his life continues in an unexpected fashion. While the jet-setting couple called it quits after almost a year, a rep for Swift confirmed to Billboard that she was the co-writer of Harris' global smash with Rihanna, "This Is What You Came For," which she penned under the pseudonym "Nils Sjöberg."
TMZ reported that Swift wrote the song at a piano and made a demo on her iPhone, which she then sent to Harris, who reportedly "loved it." An unnamed source close to Swift reportedly told the gossip site that the pair then went into a studio and did a full demo with Swift singing and Harris creating the beats.