While he typically flits between shirtless snaps and images while working out on the machines, on Monday he shared the shocking clip as he posed in a vest while a fellow a gym-goer stood behind him with no shirt on.
In the caption, Zach revealed they had chosen not to discuss their son to keep him 'out of the limelight', following their joint stint on the show, on which Becky revealed he had bedded 150 women behind her back through their four year romance.
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He has over 40,000 followers on his zachgeorgeex Instagram account.