modelling

The rare disorder gives her a "cat-like" appearance, which got the attention of British fashion photographer Nick Knight.

He first spotted the 29-year-old from Seattle on Instagram and she's since starred in V Magazine.

"It's been the most beautiful whirlwind of my life," she tells Newsbeat.

Cat eye syndrome is also called Schmid-Fraccaro syndrome.

She posted a picture on Instagram of a letter from a fan called Fiona, sent in 1994.

In it, Fiona asks two important questions of Kate Moss: How did she get into "modling", and was she really dating Johnny Depp?

If so, she says, she would love Kate and Johnny's "altographs".

Unfortunately, Moss was too busy modelling and dating Johnny Depp (it was indeed true, the pair got together that year) to reply to Fiona's note.

But she's made amends now with an Instagram post showing the handwritten letter and saying that Fiona will be getting a signed Kate Moss book.