The singer confirmed Wednesday that her 16-year-old son, Michael, entered rehab last week for undisclosed treatment.
"My son Michael is an amazing young man, shown through his courage in facing his issues. As his mother, I couldn't be more proud of him," she said in a statement. "The press and public have always been kind and gracious in the past, and I know they will continue to respect our privacy during this time."
Osmond first revealed her son's struggles during a taped segment for CNN's Larry King Live, which is scheduled to air Wednesday night.
The 48-year-old singer is expected to continue on Dancing with the Stars next Monday.
Michael is one of seven children (five, including Michael, are adopted) Osmond has with her ex-husband, music producer Brian Blosil. The couple divorced in April, after 20 years of marriage.
Osmond's disclosure comes a week after she flew to Utah to be with her family following the death of 90-year-old family patriarch George. The extended family, 100 members in all, appeared on The Oprah Winfrey Show last Friday in tribute to the elder Osmond.
During their appearance, Marie addressed her family ties.
"I did [Dancing with the Stars] initially for my kids," she said of her still-going reality-show stint. "But for women who find themselves like me, a single mom, you know, at 48...life is not over. I would rather climb a mountain than crawl in a hole."
The asthma-suffering songbird, who performed her 1970s county hit "Paper Roses" and dueted with brother Donny on their TV theme song, also chalked up last month's fainting spell, witnessed by about 20 million viewers, to the California wildfires.
But Osmond's troubles aren't all of recent vintage.
In August 2006, she shot down tabloid reports of a suicide attempt after she was hospitalized for several days in Utah. "She bascially had an adverse reaction to some medication she was taking, and she blacked out," Osmond's publicist said at the time.
In 1999, Osmond admitted to having struggled emotionally following the birth of son Matthew. She chronicled her difficulties in her 2001 memoir, Behind the Smile: My Journey out of Postpartum Depression.
Osmond's first marriage, to former BYU basketball player Stephen Craig, ended in divorce in 1985. The couple had one son, Stephen, now 24.
She wed Blosil the following year.
Marie Osmond laughs about it all in new memoir
Apr 17, 2009 7:00 am PDT
After a recent performance at the Flamingo Hotel, Marie and Donny Osmond pose for pictures and sign autographs for a group of eager fans, just as they do every night. Dressed in a black brocade coat, fishnet stockings, tall black boots an...
Big Osmond family Thanksgiving in Utah
Nov 21, 2007 1:00 pm PST
Wondering how many will show up for the Osmond family Thanksgiving in Utah? Donny Osmond jokes: "This year it's going to be 4,562." Sister Marie was staying behind in Los Angeles after making the cut Tuesday night on ABC-TV's top-rated "...
Donny Osmond apologizes to Larry King
Nov 19, 2007 7:25 am PST
Donny Osmond has apologized to Larry King for criticizing the CNN talk-show host after he revealed that Marie Osmond's 16-year-old son had entered rehab. "I was very upset about it," the 49-year-old singer said in an interview that aired...
Osmond family to reunite on `Oprah' show
Nov 7, 2007 11:35 am PST
Marie Osmond may have lost a loved one, but she's not ready to lose her place on "Dancing With the Stars." The 48-year-old singer, who missed Tuesday's results show after the death of father, will continue to compete on the top-rated dan...
Osmond stays, Cuban is voted off `Stars'
Oct 25, 2007 5:00 am PDT
Marie Osmond was down, but she's still a competitor on ABC's "Dancing With the Stars." The 48-year-old singer, who fainted during Monday's live broadcast, will see another week on the top-rated dance competition after Mark Cuban was voted...