Article continues below advertisementJustin Trudeau and Sophie Grégoire Trudeau Started Dating in 2003Source: MEGAJustin Trudeau recently sparked dating rumors with Katy Perry.Justin Trudeau's marriage to Sophie Grégoire Trudeau frequently made headlines before their separation.The pair first met as children in Montreal, as Sophie was a classmate and friend of Justin's youngest brother, Michel. She later shared she would often play at the Trudeaus' home as a child."They had a really cool pool with a trapeze and ropes and we could play Tarzan for hours," she told Maclean's in June 2005.