Nicole Richie is a Flat-Tummied Hippie

Exactly one year after giving birth to her daughter Harlow, a bohemian Nicole Richie gave us a peek of the skin and bones that people in Hollywood tend to call a 'stomach' on Saturday.

The actress was on her way home from Byron & Tracey Salon during a busy day of running errands for Harlow's birthday party on Sunday. 

But...I'm gonna guess she left the cake pick-up to her assistant, just to avoid any nagging temptation, or that thing some would call 'hunger.'