The Chainsmokers surprised students at a school in Chicago by gatecrashing their prom.
The US duo decided to drop by the dance after seeing it was taking place near their latest tour stop.
They posted a photograph on Twitter of themselves on stage with pupils from Huntley High School.
According to US reports, the pair – Andrew Taggart and Alex Pall – gave a 10-minute performance at the event.
They later teased that they might appear at another school dance.
The Chainsmokers are known for tracks including Closer, Roses and #Selfie.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here