Vassilieva in June 2009
|Born||Sofia Vladimirovna Vassilieva
October 22, 1992
Minneapolis, Minnesota, U.S
|Other names||Sonya, Sonechka|
|Education||Bachelor's degree (magna cum laude)|
|Alma mater||Columbia University|
Sofia Vladimirovna Vassilieva (born October 22, 1992) (Russian: София Владимировна Васильева) is an American actress. Her most notable roles include the children's book heroine Eloise in Eloise at the Plaza and Eloise at Christmastime, Ariel DuBois in the Emmy-winning TV series Medium, and teenage cancer patient Kate Fitzgerald in the 2009 film adaptation of My Sister's Keeper by Jodi Picoult.
Vassilieva was born in Minneapolis, Minnesota, the daughter of Russian immigrants Dr. Larissa Vassilieva, a biologist, and Dr. Vladimir Vassiliev, a physicist, both from Novosibirsk. She attended and graduated from Barbizon Modeling and Acting School in Arizona.
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.
Vassilieva played Cindy Brady in The Brady Bunch in the White House, opposite Shelley Long and Gary Cole in 2002. That same year, she was cast as a little girl named Gina in Inhabited (2003), starring Malcolm McDowell and former child actress Patty McCormack.
In 2003, she played Eloise in two made-for-television movies: Eloise at the Plaza and Eloise at Christmastime, directed by Kevin Lima and featuring Julie Andrews as Nanny. For her role as Eloise, Vassilieva was nominated for the Best Leading Young Actress in a TV Movie, Miniseries or Special at the 2004 Young Artist Awards.
In May 2004, at the age of eleven, Vassilieva was cast as Ariel DuBois in Medium, a series about mother-of-three and consultant to the Phoenix District Attorney's office Allison DuBois (Patricia Arquette), whose psychic visions help solve crimes. The series premiered on January 3, 2005. Vassilieva played the daughter of Arquette's character for seven seasons, until the series' finale on January 21, 2011. 
Vassilieva was a presenter of Family Feature Film on the Humane Society's 19th Genesis Awards in 2005. She won a Young Artist Award in 2006 for Best Supporting Actress in a TV Drama for her role as Ariel DuBois in Medium.
Vassilieva played the lead role of terminally ill teenager Kate Fitzgerald in the 2009 adaptation of Jodi Picoult's novel My Sister's Keeper, directed by Nick Cassavetes. She starred alongside Cameron Diaz, Jason Patric, and Abigail Breslin. Vassilieva shaved her head and eyebrows for her role as a teenage cancer patient. In the same year, she became an honorary ambassador for Stand Up to Cancer. For her performance as Kate, Vassilieva won a Young Artist Award for Best Supporting Actress in a Feature Film in 2010. It was her third nomination and second win. 
On May 21, 2014, Vassilieva graduated from Columbia College, Columbia University with a Bachelor of Arts and Science degree. She has also completed a Linguistics major with honors, and a special concentration in Business Management. Vassilieva is a member of Alpha Omicron Pi Fraternity.
|2001||The Brady Bunch in the White House||Cindy Brady||TV movie|
|2003||Eloise at the Plaza||Eloise||TV movie|
|2003||Eloise at Christmastime||Eloise||TV movie|
|2009||My Sister's Keeper||Kate Fitzgerald|
|2010||Stand Up to Cancer||Herself||Telethon|
|2011, 2013||Law & Order: Special Victims Unit||Sarah Walsh||TV series (2 episodes)|
|2013||Call Me Crazy: A Five Film||Allison||TV Movie|
|2015||Stalker||Dierdre||TV Series (1 episode)|
- "My Sister's Keeper". movieset.com. Retrieved 2009-07-01.
- "Barbizon Modeling and Acting - Alumni". http://www.barbizonmodeling.com.
- "Sofia Vassilieva debut of series Medium". IMTA official blog. Retrieved 2006-10-23.
- Deutsch, Robert (2003-04-24). "Life imitates art at The Plaza hotel". USA Today.com. Retrieved 2007-10-23.
- Hughes, Mike. "'Eloise' a role quite befitting a young, adventurous actress". Chicago Sun-Times. Archived from the original on 2007-11-22. Retrieved 2007-10-23.
- "Sofia Vassilieva Chats About Medium". TVGuide.com. Retrieved 2007-10-23.
- "Role of cancer patient emotional for teen actress Sofia Vassilieva". azcentral.com. Retrieved 17 October 2013.
- "All Grown Up", TV Guide, July 11, 2011, page 6
- HURT - the movie
- Breslin, Vassilieva to star in 'Keeper'