Sweet Double Duff!

Sweet Double Duff!Hilary Duff joins big sis Haylie Duff for a morning work-out in Los Angeles on Wednesday (July 28).“Up early for a workout, NYC’s amazing food killed me!” Haylie tweeted. “Gettin’ back baby. Gettin’ back.”Hilary & Haylie Duff in leggings leaving a gym in West Hollywood