Hilary Duff & Haylie Duff pictures Hilary Duff & Haylie Duff biography Hilary Duff & Haylie Duff songs Hilary Duff & Haylie Duff albums Hilary & Haylie Duff are the popular duo of the hit song Our Lips Are Sealed. They also did a cover of Madonna’s “Material Girl”, for their 2006 film “Material Girls”

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