Halsey Joins Panic! At The Disco Onstage for "I Write Sins Not Tragedies"

Turns out Halsey is a Panic! At The Disco superfan. She's gushed over them in several interviews, they performed together at Coachella, basically she's obsessed, and we're so here for it. 

So obviously, when our girl got called up onstage to sing "I Write Sins..." she gave it her all.