Olivia Jane d'Abo (/ˈdɑːboʊ/; born 22 January 1969) is a British-American actress and singer. She is known for her roles as Karen Arnold, Kevin Arnold's rebellious teenaged hippie sister in the ABC comedy-drama series The Wonder Years (1988–1993), as female serial killer Nicole Wallace in Law & Order: Criminal Intent, as Marie Blake on The Single Guy (1995–1997), and Jane Porter in The Legend of Tarzan (2001–2003). Her film appearances include roles in Conan the Destroyer (1984) and Bank Robber (1993).
D'Abo was born on 22 January 1969 in London, England, the daughter of Maggie London, an English model and actress primarily active in the 1960s, and Mike d'Abo, an English singer and member of 1960s musical group Manfred Mann. She has an older brother, two half-brothers and one half-sister: elder brother Ben, younger half-brother Bruno, and younger sibling twins Ella and Louis (born July 2007) on her father's side. Olivia and Ben both attended high school in the United States at Los Feliz Hills School (formerly the Apple School) in Los Angeles, and d'Abo attended Pacoima Junior High School in Pacoima, Los Angeles.
She is the first cousin once removed of her father's cousin Maryam d'Abo (b. 1960), the actress best known for her performance as Kara Milovy in the 1987 James Bond film The Living Daylights. Olivia and Maryam bought a house together in Los Angeles when Olivia was 19 years old.

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