Elizabeth Olsen is Mary-Kate and Ashley Olsen's younger sister. With her role as Scarlet Witch in the "Captain America" and "Avengers" movies, the 27-year-old is on her way to becoming a huge star.

Olsen's earliest IMDb credits are cameos in her ... When a fan asked how do you tell the twins apart, she replied, "Ashley has the dot and Mary-Kate doesn't," indicating a small freckle above ...