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Taylor Swift's new Disney+ docuseries, The End of an Era, premiered with its first two episodes on Dec. 12

In the first episode, Swift is filmed on day one of rehearsals in a sweatshirt she may have had to retire

The Pennsylvania-born pop star sported an oversized grey Philadelphia Eagles crewneck sweatshirt

Taylor Swift has a history of cheering on teams with a Kelce on their roster, even before she started dating Travis Kelce .

Swift recently released her new Disney+ docuseries , Taylor Swift: The Eras Tour | The End of an Era , which chronicles the six months of developing and rehearsing for the titular tour.

In the first episode, Swift, who will be 36 on Dec. 13, arrives on the first day of rehearsals representing the Philadelphia Eagles. Swift grew up near

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