As an up and coming musician, Justin Trudeau's son Xavier "Xav" Trudeau is thrilled to see his father dating pop star Katy Perry. "When I'm really happy with a song [I] send it [to her]," Xav, 18, said of his dynamic with Perry, 41, during the Wednesday, April 8, episode of the "Can't Be Censored" podcast. "She's always happy to give me advice or tell me what I should change." Xav noted that he has a good relationship with the "Roar" singer and has grown to know her in the year since she and the former Canadian Prime Minister, 54, began dating. "She's super nice. She's super down to earth.