Despite being nominated for best pop vocal album at the ceremony in Los Angeles, the singer posted a picture of herself in the capital, adding that she was "bout to go give some high fives" after Alwyn's film The Favourite won seven awards.
FYI: Taylor is wearing Stella McCartney.
This year Swift is just one of a handful of stars sitting out the Grammys, including Beyoncé, Jay Z, Rihanna, Drake, Childish Gambino aka Donald Glover, Kendrick Lamar, and Ariana Grande - who had a public fall out with the awards show this past week after she addressed rumors about why she made a decision to pull out of a performance.
The couple were later photographed leaving the British Vogue after-party hand in hand.
Swift, one of the biggest selling artists in the world, has written numerous songs about her relationships, with many speculating that several from latest album Reputation were about Alwyn.
And instead, she got to celebrate her boyfriend of a year and a half after his big moment! The 27-year-old actor did, however, chat with ET about whether he'd ever work with his famous girlfriend.