A group of students at Harlem’s PS/MS 161 got the surprise of a lifetime when Beyonce popped up in the middle of their flash dance routine of the R&B/Pop star’s “Move Your Body” song, which promotes First Lady Michelle Obama’s “Let’s Move!” campaign against childhood obesity. The superstar danced her butt off with the PS/MS 161 students, who didn’t miss a beat we might add, and posed for some pictures afterwards.

Check them out, along with footage of the routine, below:

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