The internet couldn't believe their eyes – and like clockwork, the people's champ himself even responded to the hilarious picture.
Maybe it's diet, maybe it's his workouts, or maybe it's the fact he's one of the biggest superstars in the world today and can afford to look after himself better than most.
But there's no doubting he works hard for it. Want to train like Johnson? Here are the 5 muscle-building tips he swears by.