Beyonce, Michelle Obama Surprise Kids at School

So much for a regular day at school.

On Tuesday, students at a New York City public school were working out to a Beyonce song when they got a big surprise: The singing sensation herself!

About 85 students at P.S. 161 in Harlem were performing Beyonce's hit "Get Me Bodied" - part of a national simulcast of First Lady Michelle Obama's fitness campaign, "Let's Move Flash Workout."

Wearing stiletto heels and a T-shirt emblazoned with "Let's Move,” Beyonce arrived during the middle of the routine and joined in.

Aisha Collier, 13, gushed to the New York Post that the singer was “so beautiful." 

Meanwhile, Michelle Obama herself showed off her moves at Alice Deal Middle School in Washington, D.C. Tuesday. She danced to Beyonce's "Move Your Body,” The Atlantic reports.