The actor's 22-year-old daughter lashed out at her dad's girlfriend after a photo of her was shared on an Instagram fan page describing her as beautiful.
"Most beautiful and talented woman on earth? Oh man y'all are delusional. The girl is a piece of trash [sic]'' Clara commented on the picture.
Her remarks come seven months after McGregor filed for divorce from his wife - Clara's mother - Eve Mavrakis.
The estranged couple are also parents to Jamyan, 16, Esther, 15 and Anouk, six.
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