Nicole Ritchie's weight has been worryingly low recently.

Ritchie has looked healthier in recent years, but was snapped looking scary-skinny. Is she plunging her way back down to size zero?

The reality TV star, 31, was seen wearing a pink two-piece outfit at the Simone Camille Trunk fashion party in Los Angeles. The outfit showed her stick-thin arms and exposed her ribs, which were visible under her skin.

Nicole Ritchie looked even thinner than usual in the outfit, sparking concerns about her weight.

The Simple Life star may be reverting back to her 2006-era ways, when she was so thin she made tabloid headlines and an eating disorder was frequent gossip.

At the time, Ritchie called it the result of a breakup, saying, 'I had a bad breakup, and it eats me up inside when I'm upset about something.'

'I get really stressed out, and I do lose my appetite, but I do force myself to eat. I tried to put the weight on my way, eating burritos, but that wasn't working, so I started seeing a nutritionist and a doctor.'

Now, however, Ritchie looks like she could use a nituritionist again...she looks fragile and hungry. She was also seen running in Runyon Canyon Park in Los Angeles recently.

After a round of tabloid pictures in 2006, Ritchie said, 'I know I'm too thin right now, so I wouldn't want any young girl looking at me and saying, 'That's what I want to look like'.

'I do know that they will, which is another reason I really do need to do something about it. I'm not happy with the way I look right now.'

What do you think? Is Nicole Ritchie getting scary skinny again? Sound off in the comments below!