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Taylor Swift and Travis Kelce 's "love story" update has all of Hollywood rejoicing ... with their various A-list friends praising the big news on social media.

We reported the news earlier today, when Tay and Trav dropped a joint announcement on Instagram, sharing pictures from their floral-filled engagement ... and a close-up of T Swift's new, massive diamond ring.

And it wasn't just Swifties flocking to the internet to celebrate the news, as Taylor and Travis' celebrity friends shared their own joyful responses.

Take a look ... Sabrina Carpenter -- who opened up for Taylor on her sold-out global "Eras" tour -- reposted the Swelce engagement news alongside a series of white hearts.

Then Travis' Kansas City Chiefs teammate Patr

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