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Amanda Righetti (born April 4, 1983) is an American actress and former model. She is best known for her roles as Grace Van Pelt on The Mentalist, Madeline Kenner in Colony, Whitney in Friday the 13th (2009), Isabel in Role Models (2008), Jenna Moretti on FOX's series Reunion, Tessa Lewis on FOX's primetime soap North Shore, Hailey Nichol on FOX's series The O.C. She also had a small role as a SHIELD Agent in Captain America: The First Avenger (2009).

She began modeling at age 14, then later moved to Los Angeles at age 18 to start her acting career. After securing a role in the pilot for a proposed series by the name of No Place Like Home, she played a recurring character in the teen drama The O.C. In April 2008, she was cast as the female lead in the slasher film Friday the 13th (2009). That same year, she was signed to the CBS series The Mentalist, in the role of Grace Van Pelt. Her 2012 to 2013 pregnancy was not reflected in her character's storyline, during which she was filmed using selective angles and largely limited to desk duty.

She married director and writer Jordan Alan on April 29, 2006, and they have a son, born in 2013. She filed for divorce in 2017.