The singer told the crowd: “When I was young there was one band that changed my fucking life!”
Urie then arrived on stage at the California festival – and joined Halsey as the pair dueted on ‘New Americana’, taken from debut album ‘Badlands’.
But Urie then stayed on stage, and joined forces with the singer once more –with a performance of Panic At The Disco’s ‘I Write Sins Not Tragedies’.
Describing the performance on Twitter, Halsey wrote: ‘Thank you @brendonurie for performing with a girl who sat at 14 and sang all your songs with fierce determination to be just like you one day.
Urie replied: ‘Thank YOU for allowing a musician like me to be a part of something so great. I had a blast.’
@halsey thank YOU for allowing a musician like me to be a part of something so great. I had a blast and you are wonderful.
— Brendon Urie (@brendonurie) April 17, 2016
The pair have previously been open in their admiration of each other, with Urie admitting that he’d love to work with her.
He told Fuse: ‘I got to meet her and she’s a phenomenal performer. She is such a good singer, has such a good message, she’s so good onstage, charismatic.’
Halsey has been similarly forthcoming with her praise, and only last week paid tribute on Urie’s birthday – describing him as ‘one of the most important people in my life.’
happy birthday to one of the most important people in my life. 1 and only.