The NFL offseason is in full swing, and George Kittle is taking full advantage of his break from football ... not only sitting ringside for WWE's Raw, but also getting in on the action!
The 49ers star-tight end swung by the WWE event in Nashville Monday night ... hopping in the ring with the promotion's newest superstar and good friend -- Penta.
Rocking a red and gold luchador mask, the two entertained the crowd by hitting Penta's "Cero Miedo" line, which Kittle sometimes uses during his games.