Taylor Swift has praise for her BFF Selena Gomez after SG's recent nuptials , calling her bridal look "the most beautiful thing" she's ever seen -- and she's likely taking notes ... 'cause she's up next! Play video content

The "Fate of Ophelia" singer -- who is planning her own wedding to Travis Kelce -- gushed over Selena's wedding to Benny Blanco during an appearance on SiriusXM's "The Morning Mash Up" Monday ... calling her "the most beautiful bride."

And she's fully sincere, because later, Tay Tay went even further, declaring, "Not just the most beautiful bride ... Just like the most beautiful thing I've ever seen."

Selena married Benny in Santa Barbara, California September 27, after publicly confirming their romance almost two years earlier. Taylor watched the

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