Sofia Vladimirovna Vassilieva (born October 22, 1992; Russian: София Владимировнa Васильева) is an American actress. She is best known for playing the children's book heroine Eloise, in two made-for-television movies, Ariel Dubois in the Emmy-winning TV series Medium, and the cancer patient Kate Fitzgerald in the 2009 film adaption of My Sister's Keeper by Jodi Picoult. Vassilieva was born in Minneapolis, Minnesota, the daughter of Russian immigrant parents Drs. Larissa Vassilieva and Vladimir Vassiliev, a biologist and physicist respectively, both from Novosibirsk. At the age of seven, Vassilieva was discovered at the International Modeling and Talent Association (IMTA) in New York where she won the title of Child Actress and first runner-up Child Model Of The Year 2000. In less than one year she had the part of Elena—the granddaughter of a retired Russian General—in the episode "Deadline" of the CBS television series The Agency (2001–2003). In 2002, she played Cindy Brady in The Brady Bunch in the White House (2002) opposite Shelley Long and Gary Cole; a little girl named Gina in Inhabited (2003) opposite Malcolm McDowell; and The Bad Seed's former child actress Patty McCormack.