Backstreet Boys' AJ McLean Casually Hangs Out With Taylor Swift, and We're FREAKING Out!

Here's a mashup we never saw coming! Following the Backstreet Boys' wildly successful release of "Don't Go Breaking My Heart" earlier this week, AJ McLean celebrated by attending Taylor Swift's Reputation stadium tour in Pasadena, CA, on Friday. "Ended the week celebrating a #1 record with the incredible @taylorswift13!" the singer wrote on Twitter. "Thanks so much for hooking me and the fam up tonight!!" He even shared an adorable selfie of them showing off their matching black fingernail polish. Now if only we could get Taylor to collaborate with the Backstreet Boys for a song.