Kate Moss looking thin is nothing new - the British supermodel has made a career out of her waif-like figure.

However, new pictures have emerged of the star looking exceptionally gaunt - something she has escaped since giving birth to her daughter Lila Grace despite her wild partying and alleged drug use.

Kate, who is dating infamous drug addict Pete Doherty, attended the 65th birthday party of Paul McCartney. Dressed in a little white dress, Kate's ribs, flat chest and "worryingly" thin legs were on display.

According to the resident doctor at England's The Sun tabloid, Kate is incredibly underweight.

The doctor explained, "She's abnormally thin, worryingly so. You can see the outline of muscle on her thigh because there's so little fat now. We're used to seeing her slim, but this is the thinnest I've ever seen her. This looks like a young woman who's neglecting herself. We know she doesn't exercise much so she must be eating very, very little."

The doctor said that many factors can contribute to extreme weight loss, including, "Stress, depression, drugs and alcoholism can often be behind not eating enough and losing weight.

He continued, "Kate looks too frail to stand unaided. Her head is disproportionately large and too heavy to keep up. She's never been big busted but now she's completely flat-chested. You can see her ribs."

Kate exploded onto the modeling scene thanks to Calvin Klein. Back when Amazonian goddesses like Christy Turlington and Cindy Crawford ruled the runway, Kate's child-like figure revolutionized the fashion industry.

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