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We've already declared Justin Trudeau the sexiest world leader [2], but the Canadian prime minister looked even hotter on daddy duty when he brought his 3-year-old son, Hadrien, to work last week. "Had some company at the office today!" Trudeau captioned the heart-stealing post. The father-son duo appeared to have the time of their lives running around the office building and playing a game of hide-and-seek. Click through the slideshow above to see all of the adorable photos that will steal your heart and prove once again why you wish Trudeau was former President Barack Obama's successor [3].