Scarlett Ingrid Johansson was born in the Manhattan borough of New York City, New York. Her father, Karsten Olaf Johansson, is an architect originally from Copenhagen, Denmark, and her paternal grandfather, Ejner Johansson, was an art historian, screenwriter and film director, whose own father was Swedish. Johansson's mother, Melanie Sloan, a producer, comes from an Ashkenazi Jewish family of Polish and Belarusian descent. She has an older sister, Vanessa, also an actress; an older brother, Adrian; and a twin brother, Hunter.

Johansson is Jewish and celebrates both Christmas and Hanukkah. She has stated that she dislikes it when celebrities thank God or Jesus in their award acceptance speeches. While attending PCS, Johansson dated classmate Jack Antonoff from 2001 to 2002. She dated her Black Dahlia co-star Josh Hartnett for about two years until the end of 2006; Hartnett said they split because their busy schedules kept them apart. Johansson began a relationship with Canadian actor Ryan Reynolds in 2007; they became engaged in May 2008, married in September 2008, separated in December 2010, and divorced in July 2011.  In November 2012, Johansson started dating Frenchman Romain Dauriac, the owner of an advertising agency; they became engaged the following September. The couple divided their time between New York City and Paris. In 2014, she gave birth to their daughter, Rose Dorothy Dauriac. Johansson and Dauriac married that October in Philipsburg, Montana. They separated in mid-2016, and divorced in September 2017.  Johansson has criticized the media for promoting an image that causes unhealthy diets and eating disorders among women. In one article she wrote for HuffPost, she encouraged the reader to maintain a healthy body. She appeared nude on the cover of the March 2006 issue of Vanity Fair alongside actress Keira Knightley and fully clothed fashion designer Tom Ford. This caused some controversy as it was believed the photo demonstrated that women are forced to flaunt their sexuality more often than men. In September 2011, nude photographs of Johansson hacked from her cell phone were published online. Following an FBI investigation, the hacker was arrested, pleaded guilty, and was sentenced to 10 years in prison. Johansson said the photos had been sent to her then-husband, Reynolds, three years before the incident. In 2014, Johansson won a lawsuit against French publisher JC Lattes for defamatory statements about her relationships in the novel The First Thing We Look At by Gregoire Delacourt. Johansson was awarded $3,400; she had claimed $68,000.

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