10/23/2016 7:20 AM PDT BY TMZ STAFF
Taylor Swift did something she’s never, ever ever done before … sang “This is What You Came For” live.
Taylor was performing at the Formula 1 U.S. Grand Prix in Austin Saturday night, when she rolled out the song that triggered a war between her and ex-BF Calvin Harris.
Nils Sjoberg joined her for the performance.
