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It's hard to keep your private life private in Hollywood, but stars such as January Jones and Lena Headey have managed to keep one major secret from going public: the identity of their baby daddies!
Scroll through the gallery for a look at more celebs who've kept their children's father a mystery.
The actress gave birth to son Xander Dane Jones in September 2011 and has yet to reveal the identity of his father. She previously said of the situation, "I knew I would be raising my son alone. It was something I went into knowingly, I was prepared mentally — and I was excited about it.”
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Lena Headey
The Game of Thrones star gave birth to her second child, a girl, in July 2015, and it remains unclear who the father is. Some fans have assumed the dad is Lena's ex-husband, Peter Loughran, though the duo divorced in 2013. Her GoT co-star, Pedro Pascal, was also rumored to be the father.
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Camryn Manheim
The Person of Interest star gave birth to her only child, Milo, in March 2001, and has remained tight-lipped about the dad ever since.
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Minnie Driver
The Oscar nominee welcomed son Henry in September 2008, and kept his father's identity secret for three years. It was later revealed that TV producer Timothy J. Lea, who worked with Minnie on The Riches, is the dad. "I don't need to protect him anymore," the actress said in 2012. "He can fend for himself. He's a grown-up. We weren't together and he wasn't directly in the business so I chose to protect him and not have a rain of publicity."
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Geri Halliwell
The former Spice Girl had daughter Bluebell Madonna in May 2006, but kept her father off the birth certificate. It has since been revealed that screenwriter Sacha Gervasi is the dad. The duo reportedly had a six-week fling in 2005.
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Karen Mulder
The controversial model gave birth to a daughter named Anna in October 2006. She's never revealed who the father is, but made headlines again in 2009 for threatening to attack her plastic surgeon.
