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Mariska Hargitay, star of Law & Order: SVU, revealed a long-held family secret: her biological father is not her longtime believed father, Mickey Hargitay, but Italian entertainer Nelson Sardelli. She discovered the truth in her 20s after seeing a photo of Sardelli. While she eventually connected with Sardelli, she maintains a strong sense of loyalty to Mickey, who raised her, and considers him her father. This revelation is featured in her new documentary, "My Mom Jayne," which premiered at Cannes.

Prepared by Emily Rhodes and reviewed by editorial team.