Taylor Swift and boyfriend Joe Alwyn made a rare outing together at the “SNL” afterparty.

Swift performed her new singles, “Lover” and “False God,” on the show and held hands with “The Favourite” actor Alwyn as they arrived at Midtown’s Zuma early Sunday.

Emmy-winning “Fleabag” star Phoebe Waller-Bridge hosted the episode.

And Page Six is told that a ton of celeb fans turned up to watch PWB and Swift, including Steven Spielberg, Lin-Manuel Miranda, Adam Sandler and his daughters, and Chris Rock.

A source said Studio 8H was a veritable Who’s Who of big names, saying: “Everyone adores Phoebe and Taylor.”