Heisman Trophy winning quarterback Johnny Manziel -- aka Johnny Football -- celebrated his team's recent big victory with a bottle of Dom Perignon -- the only problem is ... he's 20.
Manziel and his Texas A&M Aggies destroyed Oklahoma in the Cotton Bowl on Friday, 41-13. On Saturday night, Manziel hit up Avenu Lounge in Dallas and as you can see in the pics ... he rather enjoyed himself.
We're told when the pics were taken, Johnny was hanging out with a small group of people in an area behind the DJ booth.
Manziel doesn't turn 21 until December and the club is a 21 and over place.