Sofia Vladimirovna Vassilieva (born October 22, 1992) is an American actress. Notable roles include portraying the children's book character Eloise in Eloise at the Plaza and Eloise at Christmastime, Ariel DuBois in the TV series Medium, and teenage cancer patient Kate Fitzgerald in the 2009 film adaptation of My Sister's Keeper by Jodi Picoult.
Early life Vassilieva was born on October 22, 1992, at the Hennepin County Medical Center in Minneapolis, Minnesota, the only child of Russian immigrants. She attended and graduated from Barbizon Modeling and Acting School in Arizona.
Career 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.
Less than a year later, Vassilieva received her first role, playing the granddaughter of a retired Russian general in an episode of the CBS television series The Agency.
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 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.
She 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 a 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.
In 2011, she guest-starred on Law & Order: Special Victims Unit in the episode "True Believers" as Sarah Walsh, a piano BFA candidate who is raped in her New York City apartment. She reprised her role as Sarah in the 2013 episode "Wonderland Story".
On May 21, 2014, Vassilieva graduated from Columbia College, Columbia University with a Bachelor of Arts and Science degree, completing a Linguistics major with honors, and a special concentration in Business Management. Vassilieva is a member of Alpha Omicron Pi, an international sorority."All Grown Up", TV Guide, July 11, 2011, page 6
In 2018 and 2021, Vassilieva worked on Black Lightning as Looker.
In 2023, she won the Best Actress in a Feature Film award at the First Glance Film Festival in Los Angeles for her role as Lissa in Lissa's Trip.
Filmography + Film Roles Year Film/Show Role Notes 2007 Day Zero Mara 2009 Hurt Sarah Parsons 2009 My Sister's Keeper Kate Fitzgerald 2020 Brighton Beach Dasha 2021The Little ThingsTina Salvatore13 MinutesMaddy2023 Lissa's Trip Lissa2024 Here's Yianni! Kali
+ Television Roles Year Film/Show Role Notes2001 The Agency Elena 1 episode The Brady Bunch in the White House Cindy Brady TV movie2003 Eloise at the Plaza Eloise TV movie Eloise at Christmastime Eloise TV movie Inhabited Gina Russell Main cast 2005–2011 Medium Ariel Dubois Main cast 2011, 2013 Law & Order: Special Victims Unit Sarah Walsh 2 episodes 2013 Call Me Crazy: A Five Film Allison TV movie 2015 Stalker Dierdre 1 episode2016 Lucifer Debra 1 episode Notorious Jenna 1 episode2017 Training Day Chelsea Brown 1 episode Criminal Minds: Beyond Borders Roxy Bental 1 episode Max Bess TV movie2017-2018 Supergirl Olivia 2 episodes2018 Bad Stepmother Verity TV movie Timeless Abiah Franklin 1 episode S.W.A.T. Lauren 1 episode2018-2021 Black Lightning Looker 4 episodes2019Looking for AlaskaLara Buterskaya Limited-run series2021 All Rise Olga Kirilenko Petrovic 1 episode2022Chicago FireAdriana 1 episode 2023Blue Bloods Officer Carlie Gillson 1 episode 2025Duster Jessica-Lorraine Sims Recurring 2026The RookieMargaret 1 episode
+ Video game roles Year Title Role Notes 2016 Mafia III Anna McGee DLC "Sign of the Times" 2017 Call of Duty: WWII Hazel Daniels
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