It's only been a month since Nicole Richie announced she was seeking treatment for her inability to gain weight, but friends are noticing a difference, PEOPLE reports in its upcoming issue.
"She has (put on) at least 5 lbs.," says a source close to the actress. "She wants to prove she's trying to change."
The newly brunette Richie has even "distanced herself from a lot of (old) friends," adds the source. Among those old friends is Rachel Zoe, 35, Richie's stylist for the past three years, with whom Richie split last week