Beyonce made a group of children very happy this week when she made a surprise appearance at Harlem Target and even joined them for a special performance.

According to CBS New York, over 150 kids from various youth groups gathered at the store to learn some of Beyonce's signature dance moves with help from her backup dancers. A group of kids was on stage performing a routine to B's 'Countdown' when the singer herself appeared to join in on the fun.

With squeals of delight and looks of "OMG!" on their faces, the kids kept dancing in their once-in-a-lifetime performance while Beyonce herself got in the groove.

"It was amazing. I didn't even know she was behind me," Symone Huggins, 15, said. "I turned and was like 'Oh my God!'"