The model, 22, arrived at friend Suki Waterhouse's house (19 June) with actress Clara Paget and couldn't even raise a smile for waiting photographers.
Dressed all in black with bold white stripes, Cara wore her trademark hi-tops, minimal make-up and her hair loose and shiny.
Her night out followed the publication of an in-depth interview in Vogue magazine.
In the chat, Cara describes her upper class childhood in Belgravia with a mother who battled heroin addiction.
She says: "It shapes the childhood of every kid whose parent has an addiction. You grow up too quickly because you're parenting your parents."
Cara also opens up for the first time about her troubled teenager years in boarding school.
She reveals: "This is something I haven't been open about, but it's a huge part of who I am. All of a sudden I was hit with a massive wave of depression and anxiety and self-hatred, where the feelings were so painful that I would slam my head against a tree to try to knock myself out.
"I never cut, but I'd scratch myself to the point of bleeding."
On a happier note, Cara also talks about "being in love" and coming to terms with her sexuality.
She has been with her girlfriend, singer St. Vincent - real name Annie Clark - since February.
This month, Cara appears in her first leading role in Paper Towns, adapted from John Green's novel of the same name.
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