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Originally appeared on E! Online<\/a><\/em>.<\/p>\n Katy Perry<\/a>\u2019s \u201cleft shark\u201d lives on.<\/p>\n Over ten years after the \u201cRoar\u201d singer\u2019s shark backup dancer \u2014 specifically the one to her left \u2014 went viral for its dance moves<\/a> during the 2015 Super Bowl Halftime Show, Justin Trudeau<\/a> made a subtle reference to the moment with his Halloween costume amid his and Perry’s burgeoning romance.<\/p>\n For his partner costume with 11-year-old son Hadrien Trudeau \u2014 one of three children Trudeau shares with ex-wife Sophie Gr\u00e9goire Trudeau \u2014 the former Canadian Prime Minister dressed up in an inflatable shark costume, holding aloft a bitten surfboard as Hadrien cowered as a surfer by his dad\u2019s side.<\/p>\n \u201cReady for Halloween with Hadrien: he\u2019s the surfer, I\u2019m the shark (to his left),\u201d Trudeau captioned his Oct. 31 post<\/a>, including a reference to left shark. \u201cWe built the costume together \u2014a little father-son Halloween teamwork.\u201d<\/p>\n And indeed, in addition to the photo of Trudeau and Hadrien posing was one of the 53-year-old \u2014 also dad to Xavier Trudeau, 17, Ella-Grace Trudeau, 16 \u2014 crafting the surfboard from foam board at his dining room table and one of Hadrien painting it.<\/p>\n READ<\/b> Katy Perry Subtly soft launches Justin Trudeau relationship<\/a><\/p>\n But while Trudeau’s reference to Perry may have been an if-you-know-you-know moment, her fans definitely<\/em> knew. Soon enough, his comment section was home to a GIF from the 2015 Super Bowl halftime show in question, featuring Left Shark.<\/p>\n Days before Trudeau’s social media nod to the \u201cFirework\u201d artist, Perry \u2014 who is mom to 5-year-old Daisy Dove with ex-fianc\u00e9 Orlando Bloom<\/a> \u2014 subtly soft launched their relationship<\/a> on social media, months after the pair first sparked romance rumors with a dinner outing in Montreal.<\/p>\n Within Perry’s Instagram post celebrating her 41st birthday was a video of her blowing the candles out on a cake backstage at one of her Lifetimes Tour concert dates. In the clip, hidden among the dancers and crew members clapping and cheering Perry on was Trudeau, his smiling face visible for just a moment.<\/p>\n She captioned the Oct. 29 photo carousel<\/a>, alongside a biting lip and heart emoji, \u201cLevel 41.\u201d<\/p>\n But while Trudeau was swimming in the seas on Halloween, Perry continued her Lifetimes Tour in Europe, with dates in Prague, Czech Republic, and Munich, Germany, on Oct. 30 and 31.<\/p>\n Sharing a glimpse of her time in the first city, Perry captioned a Halloween photo dump on Instagram<\/a>, \u201cThank you Prague. I went in your clock and I am filled with your schnitzel.\u201d<\/p>\n PHOTOS<\/b>: Billie Eilish at Halloween Horror Nights Hollywood 2025<\/a><\/p>\n<\/p><\/div>\n