How could they not?
Selena even got her makeup done by Louis Tomlinson's sister, Lottie, for the show - posing for a smoochy cute pic and writing: "My baby @lottietommo123 did me up tonight.
She also had fans scratching their heads when she posted (then deleted) a snap with some of Niall's pals, captioning it: "I have a serious thing for mullingar guys." The the caption was edited to add: "(I did NOT post this)"
Is she trying to tell us something? Or nothing. We're confused.
Also? Niall liked a fan's tweet about Selena's pic, which seemed to confirm it was all a little joke: "chill, niall's friends posted it as a prank and that's why selena wrote 'I did NOT post this' before deleting it"
Adding to the confusion, Selena was also spied at the X Factor afterparty with the One Direction guys, with pics snapped of Selena and Niall leaving together.
chill, niall's friends posted it as a prank and that's why selena wrote "I did NOT post this" before deleting it pic.twitter.com/crkinze3Z3— marie (@wasteddream_) December 13, 2015
One fan seemed to have the inside scoop backstage at the show, tweeting a play-by-play of the action:
So just walked past selena, niall, grimmy and the contestants backstage at x factor?? Trying to keep my cool..!!— Beck Davidson (@BeckDavidson1) December 13, 2015
Pretty darrrrrrn close 😉😉 https://t.co/VXDm2IjJNF— Beck Davidson (@BeckDavidson1) December 13, 2015
Guys selena and niall are sooooooooo getting in onnnn 😉😉— Beck Davidson (@BeckDavidson1) December 13, 2015