After the BAFTAs, the 29-year-old singer and Alwyn, 27, made a rare appearance at a British Vogue and Tiffany & Co. afterparty.
FYI: Taylor is wearing Stella McCartney.
It was a big night for Alwyn and his co-stars in The Favourite.
Alwyn starred alongside Olivia Colman, Rachel Weisz and Swift's pal Emma Stone in "The Favourite", which was the BAFTAs biggest victor, taking home a total of seven awards, including the prestigious Best Film. "Bout to go give some high fives - thanks @stellamccartney for this dressss".
Though they've been seen out and about from time to time, Alwyn and Swift have yet to pose together on a red carpet and are careful not to share too much about their relationship.