F ix your fuckin’ self!” Tate McRae demands, her hips circling, dark-blond hair flipping. The Canadian pop star is onstage at Madison Square Garden in New York, performing her new breakup anthem “Tit for Tat” to a sold-out crowd of roughly 15,000 fans. She’s wearing cherry-red micro shorts, a matching bra — the same shade that Britney Spears wore in the “Oops! … I Did It Again” video — and black knee socks. She joyfully skips down the catwalk and smiles before resuming her fierce, kinetic choreography, throwing her head back, tossing each leg out to the side in a lunge, her abs glistening with sweat. Toward the peak of the song, pyro explosions go off, timed to the exact second that McRae and her backup dancers all toss their hands into the air. The crowd is transfixed, screaming while

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