When Alton Sterling was killed by two white police officers in Louisiana on Tuesday there was an outpouring of of grief and protest.
A video which showed police pin the 37-year-old black man to the floor and shoot him resulted in protests and fresh support for the black lives matter movement.
Celebrities got involved, with Beyonce penning a powerful letter on her website. "We are sick and tired of the killings of young men and women in our communities. It is up to us to take a stand and demand that they 'stop killing us,'" she wrote.
But Mischa Barton got into trouble when she posted her reaction on Instagram.
I don't think Mischa Barton could have picked a worse photo to showcase her solidarity. pic.twitter.com/vHkeGKuUtQ
-- Philip Lewis (@Phil_Lewis_) July 7, 2016
The star wrote: "I'm truly heart broken to watch videos like the #altonsterling execution...Somebody make change. We need gun control and unity."
The accompanying picture was of Mischa on a yacht - a privileged lifestyle far removed from many of the victims of police brutality.
Instagram and Twitter users were quick to call her up on it.
"This is my, 'Lost in deep thought contemplating black people from my yacht where none have ever stepped foot' pose." - Mischa Barton
-- B. Miller (@BlaiseInKC) July 7, 2016
No Mischa Barton, looking sad while day-drinking on your yacht is not what is needed right now. SMH
-- Room with views (@RealParkdale) July 7, 2016
Lmao @ Mischa Barton. Who among us hasn't mourned Black death whilst sipping wine on a yacht? ?
-- Tia (@TiaKTA) July 7, 2016
Mischa Barton is sick and tired of the police shooting at her yacht. pic.twitter.com/tbZTwmuXUF
-- Keating Thomas (@keatingthomas) July 7, 2016
Mischa Barton chiming in on racism while on a yacht is the most 2016 thing of 2016
-- Adam H. Johnson (@adamjohnsonNYC) July 7, 2016
Some people defended the celebrity, arguing that in a world of silence at least she spoke up about injustice.
-- Gerren Peterson (@GerrenPeterson) July 7, 2016
I think Mischa Barton was sincere in her message. It's unfortunate that's the photo she chose to express it with.
-- Shae Kahlo (@sskahlo) July 7, 2016
Mischa has since deleted the image.