According to Digital Spy, Justin made his appearance at an assembly for summer band camp. It is thought that the 16-year-old star was there to present a cheque for $5,000 on behalf of Best Buy and the Grammy Foundation, to help pay for the school's music department.
Justin said: “The students had no idea I was coming and it was fun to completely surprise them. I was excited... to raise awareness around the important cause of funding music education programmes in schools.
“I talked to students about pursuing their passion in music and encouraging them to keep doing what they're doing.”