Hilary Duff Calls Kim Cattrall a ‘Force’ on the 'How I Met Your Father' Set (Exclusive)

ET spoke with Hilary Duff at the annual Baby2Baby gala about her ‘How I Met Your Father’ co-star, Kim Cattrall. The ‘Sex and the City’ alum is playing the older version of Hilary in the upcoming Hulu sitcom.