6. The Young Ripley Clone Was Created From Childhood Photos Of Sigourney Weaver - Alien: Resurrection
One of the opening shots of Alien: Resurrection shows off the successful Ripley clone, as she ages from youth to adulthood. The beginning of the shot, where Ripley appears young, was in fact based off photos of Sigourney Weaver as a child which she gave to the VFX crew to make the shot appear more realistic. It's one of the best shots in the whole movie, so it totally worked.