Nicole Richie attends the AOL Originals Fall Premiere Event at Palihouse Holloway on October 9, 2014 in West Hollywood, California

Nicole Richie attends the AOL Originals Fall Premiere Event at Palihouse Holloway on October 9, 2014 in West Hollywood, California

*Nicole Richie has reportedly gotten so thin that her friends are concerned for her health, according to Radar Online.

“Nicole is so skinny right now and it is really sad,” a friend of Richie’s tells the website. “Her bones are protruding, and she keeps losing more and more weight.”

“Every mom at The Buckley School is very concerned about Nicole’s weight,” says another source, whose children attend the same school as Richie’s daughter Harlow. “I don’t remember seeing her eat anything at the functions she attends for Buckley.”

Although she has never publicly admitted to having an eating disorder, in 2006, she announced her decision “to undergo diagnostic treatment to determine why she’s not been putting on any weight,” her rep said, adding that she was, “working with a team of doctors and specialists whose focus is nutrition.”

In the May 2012 issue of Glamour, Nicole denied outright that she had an eating disorder, and even went so far as to say that it was “insulting and irresponsible” as well as “a little unfair” to assume such a thing.

Richie is married to musician Joel Madden, 35, and they have two children together – Harlow, 6, and son Sparrow, 4.