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Originally appeared on E! Online .

Katy Perry ’s “left shark” lives on.

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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 Perry's burgeoning romance.

For his partner costume with 11-year-old son Hadrien Trudeau — one of three children Trudeau 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

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