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John Shearer / WireImage.com 1 / 5

By Melissa Hunter

Leave it to a converted party girl to, well, convert a party girl. In earlier reports, Nicole Richie had apparently stopped spending time with friend Mischa Barton last year after her "dark side" was getting in the way.

A source told RadarOnline, "Mischa and Nicole have been friends for years, but when Nic had Harlow, she became more domestic."

Related: Nicole shows off her tummy on the beach and more cute celeb beach pics

But Richie's maternal side apparently kicked in as she has come to her once go-to clubbing pal Mischa's side.

The source continues, "Mischa is doing great -- thanks to Nicole. She stepped in and talked to her about making changes in her life... basically doing a 360."

Related: Mischa Barton's sleazy ex and other hot starlets who dated jerks

As you may recall, pre-motherhood, Nicole had her fair share of troubled days. She was arrested back in 2006 for a DUI after driving on the wrong side of the freeway. She had admitted to taking vicodin and smoking pot before the incident. And she too was troublingly thin and was widely assumed to be anorexic. Now, between Mischa's diminishing frame and her excessive partying, it's nice to know she has a friend who can empathize and help her through this time of need.

"Mischa isn't even smoking anymore, thanks to Nicole. Nicole told Mischa that she has to straighten up because she has a lot riding on this new show ['The Beautiful Life']."

Related: Check out Mischa, Michelle Trachtenberg, and more fresh faces coming to a small screen near you

True enough considering the string of movies Mischa has made since "The O.C." have all been flops. Hanging on to this potential hit show is a chance for her to get back on her feet. Fortunately for her, Ashton Kutcher (who is producing the show) stands behind her.

"Ashton is backing her up. She's determined to get it together."

Here's hoping for another hot mess to get back on track. Lindsay Lohan, I hope you're taking notes.