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Even showgirls need to unwind.

With Taylor Swift’s latest album, “The Life of a Showgirl,” already smashing sales records — and the accompanying cinematic release likewise debuting at No. 1 — there’s no stopping the songstress.

But in case you’re wondering how the megastar relaxes, the just-announced Eras Tour documentary (set to be released on Dec. 12) offers a glimpse into how Swift unwinds after a show, including the exact bath products she uses.

In an Instagram post today, the star shared the trailer for her Disney-produced “The Eras Tour, The Final Show.” In the clip, she describes her nightly winddown routine — and we couldn’t he

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