Ewan McGregor's daughter Clara brands his girlfriend Mary Elizabeth Winstead 'a piece of trash'.

Ewan McGregor's daughter Clara lashed out at his girlfriend Mary Elizabeth Winstead in a social media attack on Thursday evening.

From her verified Instagram account, the 22-year-old model took to the comments section of an image from a fan page for the Fargo star, who was first spotted with Ewan in October, to lash out at the page administrators for calling Mary beautiful.

A seemingly enraged Clara hit out in the comments section, as she penned: 'Most beautiful and talented woman on earth? (laughing faces) Oh man y'all are delusional. The girl is a piece of trash (smiley face) x'. 

Clara has not been shy of airing her feelings on her parents' split after Ewan and Mary first went public with their budding romance in Los Angeles in November as he moves on from his wife of 22 years Eve Mavrakis.

Alongside Clara, Ewan and his estranged wife have three other children together - Jamyan, Esther and Anouk. The eldest of their kids was seemingly enraged when she saw the gushing post by a fan - leading to her 'piece of trash comment'. 

MailOnline has contacted representatives for Clara and Mary for comment.  

The McGregor family hit headlines after patriarch Ewan controversially filed for divorce from Eve in March – six months after being spotted kissing Mary.