New Kids on the Block made a music video at Cedar Grove High School, and no one even knew it.

The iconic 1980s boy band used the high school as their backdrop and managed to keep it under wraps until the video was released Friday.

The song called "Boys in the Band" features all five members and several cameos from other stars in the band's heyday, including Lance Bass and Debbie Gibson.

Gibson posted on her Twitter page shortly after it premiered, saying while she would love to take credit for the little rap, she was actually lip-syncing to a rapper named Marcella Precise.

The group filmed the video on a Saturday morning in late January.

It took roughly 18 hours to get it done.