Ms. Swift shared a video on Instagram, proving that the ladies know every single word to "The City." (Their lip synching is almost as cute as Tay's "Blank Space" theatrics for BBC.)
And it wouldn't be a Taylor Night Out if Polaroids weren't taken. She also Instagrammed these few snaps. Ellie Goulding showed up!
Some say that Swift's old flame (and 1989 inspiration) was there. Concert-goers spotted Harry Styles in the balcony.
But then again...
If the 1D boys were there, it makes sense, since Selena, Taylor and One Direction are all in town to perform at Sunday's 2014 American Music Awards. Gomez gave fans a sneak peek at AMA rehearsal yesterday and admitted that she's super nervous.
And let me remind you that Haylor might not have been the only ex-couple at the concert last night. Goulding and 1D's Niall Horan supposedly had a thing, which is rumored to be the subject of Ed Sheeran's "Don't."