Mary Cosby’s son came out of rehab a “new person” after seeking treatment for drug addiction.

The “Real Housewives of Salt Lake City” star shared the update about Robert Cosby Jr. while appearing on “Watch What Happens Live with Andy Cohen” Wednesday.

“Rob is doing so good,” she said while choking up. “I am so proud of him, so proud of him.”

Mary Cosby on "WWHL"
Mary Cosby became emotional while talking about her son Robert Cosby Jr.’s addiction on “Watch What Happens Live” Wednesday.Bravo

Mary Cosby and Robert Jr. hugging

The “Real Housewives of Salt Lake City” star shared that her son checked into rehab for one month after admitting to struggling with drugs.Bravo
Mary, 52, said Robert, 21, stayed at the center for one month and completed his program.

“He did an excellent job,” she raved. “He came out a new person.”

Andy Cohen then asked the Bravolebrity about their emotional conversation with Robert that aired in last week’s episode of “RHOSLC” in which the mother-son duo candidly talked about his addiction issues.

Mary Cosby crying
Mary had an emotional conversation with her son in last week’s episode of “RHOSLC.”Bravo

Robert Jr. Cosby
Robert confessed that he had taken several substances since he was 16.Bravo
“It wasn’t planned,” she said while starting to cry. “We just came together, Robert and I, and I said, ‘We’re going to do this because we’re going to help someone.’”

Mary explained that her son did “not plan what he was going to say” in front of the cameras and neither did she.

“I just said what I felt,” she said as Cohen, 56, reached over to take her hand and assure her she “did great.”

Mary Cosby and her son
Mary confirmed neither she nor her son “planned” what they were going to say.Bravo

Mary Cosby RHOSLC son Robert Jr
“He came out a new person,” she gushed.Mary Cosy/Instagram
Mary went on to share that Robert’s wife also sought treatment at a rehab center and is “still in there.” She raved about her husband, Robert Cosby Sr., helping both her and her son throughout the ordeal and how he was “able to guide Robert [Jr.] better.”

During the Nov. 27 episode of “RHOSLC,” Mary asked Robert Jr. to tell her the “honest truth” about what was going on with him following a period of reclusiveness.

“I’m taking Xanax,” he admitted, referring to a medication used to treat anxiety. “I just took half to chill me out, and then I take an Adderall to balance out Xanax.”

Robert Jr. crying

Robert cried while discussing his drug addiction on “RHOSLC,” as pictured here.Bravo

Mary Cosby sitting on "RHOSLC"
Mary expressed how much she “love[d]” her son and wanted to “help” him.Natalie Cass/Bravo via Getty Images
Robert Jr. described his life as “chicken unseasoned,” but when he gets high, “it’s adding seasoning to it.”

“At first, I was like, I’m just gonna stick to natural stuff. And then, I went to a party, and someone gave me a Xanax. And then I was like, ‘Oh, I like this,’ so I started buying it,” he recalled.

“Then I started doing Xanax with acid and then molly with Xanax, because I like Xanax, so I mixed it with everything — Xanax and cocaine.”

Robert Jr. posing
Robert admitted that he was taking 10 “Oxys” and “couldn’t even feel it.”Bravo

A selfie of Mary Cosby
“You’re my friend, you’re my son, you’re my gift,” she told him.Mary Cosby/TikTok
He then asked his mom, “You know the regular 30 milligram Oxys? I noticed this was, like, a turning point for me. … I was taking 10 at once, and I couldn’t even feel it. I couldn’t feel it at all.”

Mary cried throughout the heart-to-heart and told Robert Jr. that she “love[s] [him] more than anything, more than anything in this world” and would “try to help” him.

“You’re my friend, you’re my son, you’re my gift,” she continued. “God gave you to me. You’re the only thing that ever made me happy. Before I had you, I was never happy. You came in, and you were so real. You was everything I hoped for in a person.

A mirror selfie of Mary Cosby
The Bravolebrity encouraged her son to seek treatment.Instagram/mary_m_cosby

A throwback selfie of Mary Cosby and her son
Mary spoke to her son after noticing he had been acting “absent.”Bravo
“Please, baby, recognize it. Own it, and change it, because you can,” she encouraged him.

They ended their emotional conversation by sharing a hug and saying how much they love each other.