A relaxed beach day in Saint-Tropez recently put one of pop music’s biggest stars and a former Canadian prime minister back in the spotlight. Katy Perry and Justin Trudeau were photographed spending time together on the French Riviera, giving fans another glimpse of a relationship that has become one of the more unexpected celebrity pairings of recent years. The pair appeared comfortable and relaxed as they walked along the shore together. Their low-key outing was a noticeable contrast with the formal settings in which Trudeau spent years appearing as Canada’s prime minister and the large concert stages and red carpets more commonly associated with Perry. A Casual Day on the French Riviera Perry chose a light, summery look for the beach, wearing a cream-colored strapless one-piece swimsuit with a crochet-style cover-up, bucket hat and sunglasses. Trudeau kept things equally simple in navy swim trunks and sunglasses. The photographs captured them walking hand in hand and enjoying time together away from the official events and public appearances that usually draw cameras. The setting gave the outing an especially casual feel, with the pair appearing focused on their time together despite the attention surrounding their relationship. The Saint-Tropez trip came roughly a…