The two were photographed walking together and holding hands outside and also sitting inside an SUV after the show, which also featured performances from the likes of the singer's BFF Ed Sheeran and Demi Lovato. There was also a surprise appearance from Katie Holmes and 11-year-old daughter Suri Cruise, who introduced Swift.
While walking with Alwyn amid the chilly weather, the singer covered up in a knee-length plaid jacket.
Alwyn had attended the concert and also joined Swift at a backstage pre-Jingle Ball private party, which was also attended by Blake Lively and Ryan Reynolds, People reported. Swift is good friends with the married couple.
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The two were last spotted together a few months ago. They have never attended a celebrity event together. Swift had largely kept out of the spotlight over the past year before making her music comeback this past summer.
Taylor has been spending a lot of time overseas with Alwyn, mainly in his native U.K., and is very protective of him, E! News has learned exclusively.
In September, he accompanied her to her friend Abigail's wedding in Martha's Vineyard, where she served as a bridesmaid, and also attended a pre-wedding bash the singer threw for her pal in Nashville.
"He's really nice. Really, really friendly, really good dude," Sheeran said about Alwyn on the British radio show Capital Breakfast in October.