UFC stud Derrick Lewis got the CELEBRITY treatment at his little brother's school ... when a faculty announced his presence and the starstruck students swarmed him like a rockstar.
Lewis -- who just beat Travis Browne this past weekend -- was having lunch with his little bro when a school faculty member grabbed the mic and told the kids a real-life UFC fighter was in the building.
BTW, props to the future reporter who tried to get Lewis to reveal his next opponent ... want a job?
