Commenters compared Fineman to a bobblehead and said she had odd proportions.
Polls rating the outfits of FinemansMegalopoliscostarsNathalie EmmanuelandAubrey Plazaalso skewed more negative than positive.
Fineman posted a photo of a note that the fashion house wrote to welcome her to the festival.

Chloe Fineman responds to negative comments regarding her outfit at the Cannes red carpet premiere of ‘Megalopolis’.Daniele Venturelli/WireImage
We are so happy to see you wearing CELINE in Cannes, the notes said.
Wishing you a lovely Cannes Film Festival.
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Chloe Fineman at the Cannes red carpet premiere of ‘Megalopolis’.Stephane Cardinale - Corbis/Corbis via Getty

Shia LaBeouf, Jon Voight, D. B. Sweeney, Grace VanderWaal, Giancarlo Esposito, Aubrey Plaza, Francis Ford Coppola, Romy Croquet Mars, Adam Driver, Nathalie Emmanuel, Laurence Fishburne, Kathryn Hunter, Talia Shire and Chloe Fineman attend the “Megalopolis” Red Carpet at the 77th annual Cannes Film Festival.Ernesto Ruscio/Getty