Arnold Schwarzenegger's son Joseph Baena (the love child he fathered with his housekeeper) is the one who looks the most like him.
He posted some videos on instagram flexing while at the gym and he bares a very striking resemblance to his father.
2,334 Likes, 195 Comments - Joseph Baena (@projoe2) on Instagram: "It's only the beginning ???????? #progress #classicphysique @seancaseyfitness"