Reese Witherspoon left fans opened mouthed when she posted a snapshot of her daughter, Ava, on Instagram.The Little Fires Everywhere star, 44, shared a photo of the 20-year-old to her social media and the likeness was incredible.Ava was smiling for the camera while dining at a restaurant, and she is the spitting image of Reese.Although the mum-of-three didn’t acknowledge the remarkable similarities her followers most certainly did. MORE: Reese Witherspoon’s never-before-seen childhood photo is