Hilary Duff sparkled on the red carpet at the Costume Institute Gala on Monday night, and we think her date for the evening helped to put the twinkle in her eye. The happy couple is inseparable these days whether they're casually shopping, and gazing into each other's eyes or dolled up at various events. Mike has been a good sport during his hiatus from hockey season by hitting the stores and even supporting Allure's cover girl at a magazine event last night but since Hil has become a hockey fan herself it's just more evidence that these two aren't playing any games.

For more of Hilary and Mike at the Allure magazine event with Katharine McPhee just read more.

Images include: Hilary Duff, Mike Comrie, Katharine McPhee

Source, Source, and Splash News Online