The 46-year-old actress - who checked into the Arizona facility on June 19 - is said to be feeling rejuvenated after spending four weeks being treated for anxiety and depression.
A source said: "Heather is feeling really great. And she looks beautiful, just radiant. She seems happier - she told a really funny story and she laughed from her core. That's when I knew she was going to be fine. I think that's the best part of all - it's so nice to hear her laugh."
During her stay, Heather enjoyed therapeutic spa treatments, rode horses and learned to appreciate being on her own.
Heather - who was visited by her actor boyfriend Jack Wagner during her time in the clinic - can't wait to be reunited with her 10-year-old daughter Ava, from her marriage to Bon Jovi rocker Richie Sambora.
The source added: "She is most excited to be back home with Ava."
In March, Locklear's doctor called 9-1-1 over concerns that the star was suicidal.
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