Not only did she perform her little heart off but she also broke down in tears when singing her song "Love Will Remember" that's allegedly about her ex, Justin Bieber.
This is not the first time Selena has cried on stage before. It reportedly happened during the same song at her show a few nights ago too.
Of course, all of this crying has our Jelena radar going off. There were reports that she was talking to Justin again after he recently released his song "Heartbreaker" about her. She also seemed lonely when she talked about being single on Twitter earlier this week.
Selena was quick to go to Instagram after her breakdown and said she cried because she wasn't allowed to Instagram...
"Never ended such a beautiful show in tears because they wouldn't allow me to Instagram tonight. Completely heart broken and pissed. Thank you SO much Brooklyn. Ill be stoping [sic] outside Letterman tomorrow to make it up if you can make it. I love you guys more than you know. Promise...," she wrote along with a picture of herself holding up a Brooklyn tee.
Was her on-stage emotion because she's really missing the Biebs, she wasn't allowed to Instagram... or was her concert boo-hoo fest staged for attention?
Watch her emotional performance of "Love Will Remember" above and let us know what you think!
This isn't the only reason Sel should be crying. She and her band suffered a technical malfunction while on The View this morning. Watch that awkward-ness go down here!