Justin Trudeau‘s giving a nod to his new boo Katy Perry with his Halloween costume … and he even got his son involved.

The former Canadian prime minister joined forces with his son for a joint costume this year … Justin’s in a shark suit and his son Hadrien is a bloodied surfer whose board is missing a chunk from a shark bite.

It’s a pretty cool father-son costume … even before considering the reference to KP.

Justin doesn’t mention Katy in his post about the costume, simply saying … “Ready for Halloween with Hadrien: he’s the surfer, I’m the shark (to his left). We built the costume together — a little father-son Halloween teamwork.”

But it’s pretty clear Justin is giving a nod to Katy … he mentioned he’s “to his left” and the left shark was the one most folks remember from her Super Bowl performance.