According to American magazine Us Weekly, the former O.C. star is expecting a baby with long-time actor boyfriend Rachel.
Notoriously private about her personal life, there has been no comment from Rachel yet about the claim.
Rachel - who shot to fame as Summer in The O.C. and Star Wars actor Hayden have been dating for six years after meeting on the set of their sci-fi movie Jumper.
She told Health magazine recently: "He's so incredibly supportive and considerate. It's so basic – that should be there. Because these things are so much more important when you're older. This is my partner, my support, just there for me no matter what. And vice versa."
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Stars who announced pregnancies in 2014 in pictures:
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