Ewan McGregor's daughter: His girlfriend is a 'piece of trash'

Earlier this year, Ewan McGregor faced public criticism amid reports that the actor was leaving his wife of 20 years to date a co-star. But the internet's disapproval was nothing compared to the fury of his own kids.

The actor shares four children with Eve Mavrakis, 51, his wife of two decades: Clara, 22, Esther, 15, Jamyan, 17, and 7-year-old Anouk. But in fall 2017, he began a relationship with Mary Elizabeth Winstead, who played his love interest on "Fargo."

After an fan referred to Winstead on Instagram as the "most beautiful and talented woman on earth," McGregor's eldest daughter, who is a professional model, was more than happy to weigh in.

See photos of Clara McGregor:

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Ewan McGregor's daughter Clara McGregor
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Ewan McGregor's daughter Clara McGregor
@playboy 🌹 @playboy ... comme ci comme ça
PLAYBOY shot by @ungano_agriodimas @playboy
LOS ANGELES, CA - FEBRUARY 28: Clara McGregor, wearing Chanel, attends a Chanel Party to celebrate the Chanel Beauty House and @WELOVECOCO at Chanel Beauty House on February 28, 2018 in Los Angeles, California. (Photo by Stefanie Keenan/Getty Images )
LONDON, ENGLAND - FEBRUARY 19: Clara McGregor attends the Christopher Kane show during London Fashion Week February 2018 at Tate Britian on February 19, 2018 in London, England. (Photo by Darren Gerrish/WireImage)
LOS ANGELES, CA - FEBRUARY 28: Clara McGregor attends a Chanel Party to celebrate the Chanel Beauty House and @WELOVECOCO at Chanel Beauty House on February 28, 2018 in Los Angeles, California. (Photo by Emma McIntyre/Getty Images)
LONDON, ENGLAND - FEBRUARY 18: Clara Mcgregor attends the Roland Mouret show during London Fashion Week February 2018 at The National Theatre on February 18, 2018 in London, England. (Photo by Darren Gerrish/WireImage)
LONDON, ENGLAND - FEBRUARY 19: Clara McGregor attends the Roksanda show during London Fashion Week February 2018 at Eccleston Place on February 19, 2018 in London, England. (Photo by Darren Gerrish/WireImage)
🏃🏼‍♀️🏃🏼‍♀️
Back with @dolcegabbana 🌹 getting ready for their store opening show. I could get used to this crown..
LONDON, ENGLAND - FEBRUARY 17: Clara McGregor attends the Markus Lupfer show during London Fashion Week February 2018 at The Swiss Church on February 17, 2018 in London, England. (Photo by David M. Benett/Dave Benett/Getty Images)
NEW YORK, NY - NOVEMBER 14: Clara McGregor attends the 50th anniversary celebration of Wilhelmina with co-host Patti Hansen on November 14, 2017 in New York City. (Photo by Ilya S. Savenok/Getty Images for Wilhelmina Models)
NEW YORK, NY - NOVEMBER 10: Photographer Clara Mathilde McGregor, wearing CHANEL attends the CHANEL celebration of the launch of The Coco Club at The Wing Soho on November 10, 2017 in New York City. (Photo by Mark Sagliocco/Getty Images)
NEW YORK, NY - SEPTEMBER 13: Clara McGregor attends the Michael Kors Collection Spring 2018 Runway Show at Spring Studios on September 13, 2017 in New York City. (Photo by Jamie McCarthy/Getty Images for Michael Kors)
NEW YORK, NY - OCTOBER 24: Jaku Lecousous and Clara McGregor attend as American Eagle celebrates 40 years at its new AE Studio on October 24, 2017 in New York City. (Photo by Sean Zanni/Patrick McMullan via Getty Images)
NEW YORK, NY - SEPTEMBER 10: Clara McGregor attends Town & Country Magazine's Modern Swans Celebrationon at The Carlyle, September 10, 2017 in New York City. (Photo by Amber De Vos/Patrick McMullan via Getty Images)
oh hai.
the reality of the situation is that i stayed in bed all day. 🙃
THE BROOKLYN BOROUGH OF NEW YORK CITY, NY - SEPTEMBER 06: Clara McGregor attends Bulgari 'Goldea The Roman Night' fragrance launch party at 1 Hotel Brooklyn Bridge on September 6, 2017 in the Brooklyn borough of New York City, New York. (Photo by John Lamparski/WireImage)
LONDON, ENGLAND - JUNE 29: Clara McGregor attends Tatler's English Roses 2017 in association with Michael Kors at the Saatchi Gallery on June 29, 2017 in London, England. (Photo by David M Benett/Dave Benett/Getty Images for Michael Kors)
SANTA MONICA, CA - JULY 12: Clara McGregor attends the Chanel dinner celebrating Lucia Pica and the Travel Diary Makeup Collection at Capo on July 12, 2017 in Santa Monica, California. (Photo by JB Lacroix/WireImage)
NEW YORK, NY - MAY 04: Clara McGregor attends the New York City Ballet 2017 Spring Gala at David H. Koch Theater at Lincoln Center on May 4, 2017 in New York City. (Photo by Monica Schipper/WireImage)
NEW YORK, NY - MAY 22: Clara McGregor attends The Cinema Society with Hugo by Hugo Boss, Women's Health & SVEDKA host a screening of 'Baywatch' at Landmark Sunshine Cinema on May 22, 2017 in New York City. (Photo by Paul Bruinooge/Patrick McMullan via Getty Images)
NEW YORK, NY - APRIL 30: Clara Mathilde McGregor attends a screening of '3 Generations' hosted by The Weinstein Company at the Whitby Hotel on April 30, 2017 in New York City. (Photo by Andrew Toth/FilmMagic)
today with @vanessaviolaphotos 🌹
@welovecoco @welovecoco @welovecoco #workingwithchanel #welovecoco
NEW YORK, NY - MAY 02: Clara McGregor attends the launch of the Burberry DK88 Bag hosted by Christopher Bailey at Burberry Soho on May 2, 2017 in New York City. (Photo by Astrid Stawiarz/Getty Images for Burberry)
NEW YORK, NY - MAY 23: Clara McGregor attends the Valentino Resort 2018 Runway Show - After Party on May 23, 2017 in New York City. (Photo by Nicholas Hunt/WireImage,)
NEW YORK, NY - FEBRUARY 09: Clara McGregor attends The Daily Front Row x LIFEWTR New York Fashion Week opening night at Kola House on February 9, 2017 in New York City. (Photo by Andrew Toth/Getty Images for Daily Front Row)
NEW YORK, NY - APRIL 24: Clara McGregor attends the CHANEL Tribeca Film Festival Artists Dinner at Balthazar on April 24, 2017 in New York City. (Photo by Nicholas Hunt/WireImage)
NEW YORK, NY - JANUARY 17: Clara McGregor attends TWC-Dimension with Popular Mechanics, The Palm Court & Wild Turkey Bourbon Host the Premiere of 'Gold' at AMC Loews Lincoln Square on January 17, 2017 in New York City. (Photo by Sylvain Gaboury/Patrick McMullan via Getty Images)
NEW YORK, NY - MARCH 23: Clara McGregor and actor Ewan McGregor arrive at the screening of Sony Pictures Classics' 'Miles Ahead' hosted by The Cinema Society with Ketel One and Robb Report at Metrograph on March 23, 2016 in New York City. (Photo by Jamie McCarthy/Getty Images)
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"Oh man, ya'll are delusional," Clara wrote in response. "The girl is a piece of trash."

She capped off the comment with a smiley face.

The comment is Clara's first public remark about her father's relationship.

In January, McGregor made headlines when he thanked both his wife and his mistress in his Golden Globes acceptance speech.

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