Hilary Duff walked the red carpet with sister Haylie Duff last night at the world premiere of her latest most mature movie “War Inc”. One of the scenes features Hilary putting a scorpion down her pants.

Hilary’s boyfriend Mike Cormie walked her into the event, but allowed the Duff sisters to work their magic on the red carpet. But that didn’t keep Hilary from talking about her man!

Mike Cormie plays for the NHL, and Hilary says it’s become a sort of “obsession” of hers ever sine the two began dating.

“[Hockey] has kind of been a new obsession,” Duff told PEOPLE at Monday night’s premiere of her new film, War, Inc. “When I’m in New York, I’m going to hockey games a lot.”

But Hilary has her own sort of “sport” she plays – Hollywood.

“He sits through days of press, of me doing interviews, like one after another after another, and doesn’t complain about it,” said Duff (who stars alongside John Cusack and Marisa Tomei in the offbeat political satire). “He was a good sport today.

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Now isn’t that sweet of him? It must be like hours of shopping except a lot less interesting!