Taylor Swift is officially 35 years old, and her Eras Tour crew is celebrating her birthday.

Fan-favourite backup dancer Kam Saunders shared his final Eras Bejeweled solo via Instagram, and in the video, he and Swift share a hug before he repeatedly tells the star, "I love you!"

In the caption, he wrote, "I hope that today you experience tenfold the love you put out! To me, to the cast and crew, to your friends and family, and to your fans! Happy f**king birthday, gorgeous!"

More birthday messages poured in from dancers Nat Peterson, Kamilah Marshall and Jan Ravnik; backup singer Melanie Nyema and bass player Amos Heller.

Swift surprised fans on her birthday with a new archival website known as #TSErasArchives.

The announcement came from her management's Instagram account, @taylornation, who posted: "It's our favourite person's birthday. Celebrate Taylor's eras on the brand new #TSErasArchives site and go behind the scenes for some of your favourite music videos now!"

It's been a landmark year for Swift, who released her Billboard 200 chart-topping album The Tortured Poets Department, and wrapped her 149-show Eras Tour earlier this month.

On Thursday night, she won 10 Billboard Music Awards, raising her all-time wins to a record-breaking 49 and making her the most celebrated artist in BBMA history.

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