Keira Knightley

"God, that girl is gorgeous!" runs the message on the internet chatroom. "Definitely one of greatest thinspirations out there..."

Another fan agrees: "She is my one and only inspiration now, she is so amazing!"

Then there is this posting: "Keira is my ultimate inspiration. She helped me to lose weight the first time round, so let's hope she inspires me enough to do it again."

It is followed by another: "I love Keira. She is THE One." And another: "Keira Knightly is so skinny! And again, thanx for the ana [anorexia] and mia [bulimia] tips, those have really helped."

There are many more tributes to Hollywood actress Keira Knightley on the hundreds of "Pro-Ana" websites, often set up by young women to celebrate the current 'thin aesthetic' and allow them to swop tips on how best to starve themselves.