What's Tom Brady's Achilles heel?? A naked Achilles heel ... 'cause the Patriots superstar's biggest problem is being barefoot!
TB12's wife, Gisele Bundchen, revealed the random fact in Vogue's "73 Questions" ... when she answered several rapid fire questions about the New England Patriots quarterback.
One of the most interesting parts of the video ... when Gisele reveals how Tom quarterbacked a diabolical scheme back in the day to trick her into thinking her apartment flooded ... so he could propose!
Tom even makes a brief appearance in the video before Gisele spills all his secrets about their relationship and how she prepares for Patriots games.