Hilary Duff knows exactly what dreams are made of. On Friday, Oct. 3, the Disney alum, 38, made a surprise appearance at Austin City Limits Music Festival in Texas when Role Model brought her out to be his latest "Sally," while he performed the song "Sally, When the Wine Runs Out." “This is what dreams are made of,” the 28-year-old yelled into the microphone as he and the How I Met Your Father actress danced together.
