In a TMZ online article today Kate Upton the 20-year-old supermodel says she was NOT boozing illegally, at a Tigers game on July 6th, this despite a suspicious video clip.

Kate was in Tigers ace Justin Verlander's luxury suite -- when TV cameras spotted her toasting friends with a sudsy beverage. Kate's rep told TMZ underaged Kate was not drinking beer, and was only there to take in the game with a friend. The rep would not say what Kate was drinking.

A rep for the Tigers assured us "all patrons who appear to be under 30 years old are ID'd."