Beyonce Knowles surprised some residents of West Orange, NJ this past weekend -- when she joined some of the locals in a line dance at a neighborhood block party!
Beyonce and Jay-Z were probably visiting Jay's mom, who lives nearby -- and when B heard the beats from the DJ, she couldn't help but bust a few moves with some single ladies in the street.
Don't be fooled by the rocks that she's got ... she's still Beyonce from the block.
