Lindsay Lohan has some powerful positive reinforcement to stay clean -- a $25,000 necklace.

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The 24-year-old actress, recently out of rehab, showed off the heart-shaped, 10-carat diamond Rosette necklace in Los Angeles Friday, People magazine reports.

It's a gift from her friend Pascal Mouawad, a jewelry designer.

"Lindsay is looking great, she has a positive attitude, and we are looking forward to an amazing 2011 spending a lot of time together," Mouawad told People.

Mouawad said Lohan is "really driven with her career right now," but a source close to them told the magazine.

"The two have no plans to work together professionally. -- Lindsay is dear to Pascal's heart, and he thinks she is headed down the right path. He wants to keep her going in that positive direction."