Justin Trudeau is getting into the Halloween spirit with the help of girlfriend Katy Perry !

On Friday (October 31), the 53-year-old former Prime Minister of Canada took to Instagram to show of his and 11-year-old son Hadrien ‘s Halloween costumes.

Justin dressed up as “Left-Shark,” who went viral for their dance moves during the 41-year-old “Teenage Dream” singer’s 2015 Super Bowl Halftime Show !

“Ready for Halloween with Hadrien: he’s the surfer, I’m the shark (to his left),” Justin wrote. “We built the costume together — a little father-son Halloween teamwork. 🎃🦈🏄‍♂️”

Katy and Justin have been romantically linked since July and they just went Instagram official earlier this week.

During her concert in Prague on October 29, Katy referenced her relationship w

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