Justin Trudeau Subtly References Katy Perry With Fintastic Halloween Costume

Katy Perry’s “left shark” lives on. 

Over ten years after the “Roar” singer’s shark backup dancer—specifically the one to her left—went viral for its dance moves during the 2015 Super Bowl Halftime Show, Justin Trudeau made a subtle reference to the moment with his Halloween costume amid his and Katy’s burgeoning romance. 

For his partner costume with 11-year-old son Hadrien Trudeau—one of three children Justin shares with ex-wife Sophie Grégoire Trudeau—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’s side.

“Ready for Halloween with Hadrien: he’s the surfer, I’m the shark (to his left),” Justin captioned his Oct. 31 post, including a reference to left shark. “We built the costume together —a little father-son Halloween teamwork.”

And indeed, in addition to the photo of Justin and Hadrien posing was one of the 53-year-old—also dad to Xavier Trudeau, 17, Ella-Grace Trudeau, 16—crafting the surfboard from foamboard at his dining room table and one of Hadrien painting it.