It's difficult to talk about just one, since there are several, but I'll only mention four.
Cate Blanchett
An incredible actress born in Ivanhoe, Australia on May 14, 1969 (age 55). The quality with which she portrays her characters has earned her an Oscar for Best Actress, an Oscar for Best Supporting Actress, three Golden Globes, three SAG Awards, and three BAFTAs. Undoubtedly an enviable record, hence why she had to be placed first in this answer.
Nicole Kidman
She is Australian, born in Honolulu, Hawaii (USA) on June 20, 1967 (age 57), daughter of Australian parents and raised in Australia. Because she was born in the USA, she has held US citizenship since birth, thus having dual citizenship. Kidman is an excellent actress, much loved in Hollywood even by her colleagues. Many don't know that Kidman is also a great singer. She holds an Oscar for Best Actress, a SAG Award, two Golden Globe Awards, and a BAFTA.
Charlize Theron
This extraordinary actress is South African, born in the city of Benoni in the Gauteng province, 40 km from Johannesburg on August 7, 1975 (age 49). The "South African chameleon," as she is called due to her enormous versatility, has worked as an actress in the USA since 1994, but only in 2007 was she granted US citizenship, thus having dual citizenship. The astonishing quality and versatility with which she interprets her characters make her one of the most successful actresses in Hollywood, earning her several awards including an Oscar, a Golden Globe, a SAG Award, the Best Action Actress award, among many others, and numerous nominations for these same awards. England owes her at least a BAFTA – she has three nominations – but it is known that Theron's South African citizenship carries weight in the decisions, and that weight is called the "Boer War." Until the age of 16, she only spoke Afrikaans , the language of the community where she grew up. Her dedication to learning American English was such that today she has the proficiency of a native speaker. Many don't know that Charlize is also a producer, owning DENVER & Delilah Productions , and is a great dancer, having studied classical ballet between the ages of 4 and 19.
Lupita Nyong'o
A great actress born in Mexico City on March 1, 1983 (age 41). She moved to Kenya, her family's native country, when she was young. Years later, she moved to the USA to study film and theater. She won the Oscar and the SAG Award for Best Supporting Actress.