Last night at the Gabrielle Angel Ball, Tina Knowles joined Jamie Foxx on stage during his performance and showed the audience that she knows how to back that thang up! In a video caught on Instagram , we see Mama Knowles wearing a silver dress and dancing to the beat as Foxx grooves beside her. However, after a few seconds, Foxx realizes he probably shouldn’t be grinding on Bey’s mom and quickly stops, putting his hands up and gesturing that he wasn’t trying to do anything wrong–before escorting the hot mama off stage.