We weren't the only ones shocked by her trip to English soil either - the boys from Lawson were mid-song when they saw her watching from the side of the stage.
At the time, Andy tweeted this photo along with the caption "What an honour that she watched our set!" - but now he's revealed EXACTLY what Tay Tay had to say to the band after they'd finished performing.
Speaking to STV.TV Andy said: “It was a really surreal moment. We had just played at the O2 arena and we came off stage and we were chatting to a couple of the 1D lads.
"Then, from behind the crowd, Taylor Swift just came over and said 'hey guys. I’m Taylor and I just wanted to say I’m a massive fan of you guys and I love your song Standing in the Dark. I think it’s brilliant and I can’t wait till you release it in America.'”
Whadda compliment, eh? After all, if there's on person who knows something about making hits (we haven't been able to get 'I Knew You Were Trouble' out of our heads for the past 72 hours) it's Tay Swiz.
Andy Pandy was quick to deny that Hazlan has any competition from him in the romance department when it comes to Taylor though, saying: “It wasn’t like that!
"Literally, she was just really nice and said she had watched all our YouTube videos when we were making the album. That’s just surreal as we are big fans of her and we love country music.”
WELL, it sounds like there was a right music-based love in backstage at the Jingle Bell Ball this year, doesn't it?