They were dancing and cuddling at the grammys, left together
He serenaded her on her birthday
She mysteriously shows up to the "No Air" shoot
She follows him around on tour
^maybe they are like best friends, people always jump to conclusions with stuff like this.
they would make a cute couple though
or friends with benefits? lol i think they're together, they might not call it that because they're busy with schedules or whatever but they are screwing