The mixup with the blond woman at the beginning.

The beautiful Vanessa Kirby, future Princess Margaret in The Crown!

Jupiter was an illegal alien, and had been living as one for her whole life in the US. The only way she could donate her egg cells at the clinic was to go under an assumed name, and she chose the blond bimbo's name because the blond would never suspect what was going on. Incidentally, Jupiter wasn't aware that she was being hunted by outside forces, so that's why the blond was attacked by little gray guys a short time later.