Courteney Cox Arquette and her husband David have threatened legal action against anyone who publishes photographs of their baby.
The Friends star made the announcement after the snaps were leaked to several media organisations.
The photos of 10-month-old Coco were taken at her christening earlier this month, where Jennifer Aniston was named godmother.
The Arquettes were left seething as they discovered the pictures were being distributed without their permission.
Several media organisations, including Sky News, received emails from someone claiming to be Jennifer Aniston, with the photos as an attachment.
But Jennifer's representative said: "They are not from Jennifer, and we believe they have been stolen from someone who attended the christening.
"The person who is sending them out, pretending to be Jennifer, is an imposter."
The Arquettes added: "Although we are public figures, we do have a right to privacy.
"Anyone publishing these photos will be in copyright infringement and liable to legal action. We appreciate your sensitivity to this matter."
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