Zac Efron, Demi Lovato, Ben Affleck: Celebrities in Rehab

JOHN STAMOS

The former Full House star checked himself into a 30-day substance abuse program following his June 2015 DUI arrest. Opening up about the struggles leading up to his rehab stay, Stamos told Howard Stern that his parents' deaths and his divorce from Rebecca Romijn "sent me sort of down a wrong path." Soon, things had spiraled out of control: "I lost myself, I lost my sense of discipline, which my dad taught me so well, and I just became someone – more and more I was just dipping into that dark place. It happened more and more and it just got darker and darker," he told the radio show host. The actor admitted to being "embarrassed" by his "horrific DUI" and said he went into the recovery program determined to confront his demons. "I walked in those doors, I said, 'Tell me what to do.' I'll do anything I can – and if it doesn't work after the time, then it didn't work, but I'm going to apply myself a hundred percent to it." Now, the soon-to-be Fuller House actor says he's drug- and alcohol- free.

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JON HAMM

Just before Mad Men's final season premiere in March 2015, Hamm revealed he'd completed a 30-day program for alcohol abuse, "with the support of his [former] partner Jennifer Westfeldt," according to a statement from his rep. The actor – whose show involves a fair amount of drinking – was never a regular on the club scene, telling PEOPLE in 2014, "I have a couple friends who run clubs and they'll call and say come out! And I'll go and say, 'Oh yeah, I forgot I don't like this. I feel like everybody's uncle or grandfather. I'm too old.'"

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KESHA

After constant bullying about her weight and appearance, the singer entered a treatment program for eating disorders in 2014, but emerged stronger, healthier and more focused. "Happy to be back! Feeling healthy amp working on tons of new music," she Tweeted upon returning to work. "I can't thank my fans enough for all the love amp support u have given me. life is beautiful. I'm so blessed to have u all." The singer's mom, Pebe Sebert, even went to treatment with her, to "heal along with her," she told PEOPLE.

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SELENA GOMEZ

"I lost sight of who I was," Gomez said after secretly completing a two-week rehab stay in early 2014. "I listened to opinions of people and I tried to change who I am because I thought that others would accept me for it." Now healthy and inspiring her fans through outlets like Instagram, "I've learned from my actions and for all of the things I've done, I'm proudest of that," she's shared. "I've learned from my mistakes."

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ZAC EFRON

Days after stepping out with a smile at September 2013's Toronto International Film Festival, a source confirmed to PEOPLE that Efron was, indeed, "doing great" after quietly completing a rehab stint about five months before. The High School Musical alum's squeaky-clean public persona was contrasted by his low-profile partying ways that lead him to the club scene and after-hour gatherings at friends' homes. Efron changed his habits with the help of treatment. "He's taking care of himself," added the source, "and it shows."

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BEN AFFLECK

In August 2001, just before his 29th birthday, Affleck chose to enter Promises rehab center in Malibu, California. "Ben is a self-aware and smart man who had decided that a fuller life awaits him without alcohol," his spokesman said. "He … is committed to traveling a healthier road with the support of his family, friends and fans." Charlie Sheen actually helped secure the actor's room, and drove him to the facility.

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DEMI LOVATO

After fighting with her backup dancer, then-18-year-old Lovato entered treatment for "emotional and physical issues" in November 2010, staying for three months. When she emerged healthy in January 2011, the singer revealed she'd battled bipolar disorder, anorexia, bulimia and cutting. In March 2015, she celebrated three years of sobriety, posting a touching Instagram tribute to boyfriend Wilmer Valderrama, who helped her through her toughest times.

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KEITH URBAN

Less than four months after marrying Nicole Kidman, Urban entered rehab for alcohol abuse in October 2006, checking out in January 2007. In an interview a month later, the country star thanked his wife, explaining, "They say grief makes hearts and closer bonds than joy ever can. We've been through a lot, and she's been extraordinary."

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ROBERT DOWNEY JR.

Though pals like Larry Hagman and Sean Penn tried to get RDJ into rehab around the time of his late-1990s arrests on drug charges, he only went when he was sentenced, first to California Substance Abuse Treatment Facility and State Prison in 1999 and again in 2001. Upon his release in 2002, the actor said in court, "It's going to be a long time before I can ever say, 'I'm well on the road to recovery.' But this past year ... there has been progress."

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ROB LOWE

Finding himself in love with future wife Sheryl in 1990, Lowe decided it was time to stop drinking, and checked himself into the Sierra Tucson center in Arizona for 30 days. "I was willing to do whatever it took," he told PEOPLE in a 2000 article that detailed his sex tape scandal and wilder past life. He later became a "big brother" figure to Robert Downey Jr. as he battled his own demons.

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DREW BARRYMORE

In December 1988, at just 13 years old, Barrymore had completed a stint at the ASAP Family Treatment Center in Van Nuys, California, and considered herself sober. After a relapse, the young star found herself back at ASAP for three months the following year, then under the care of sober folk-rock singer David Crosby and his wife, Jan Dance, for three more months. "The truth is that you are never fully mended," she told PEOPLE once clean. "There is no happy ending because there is no end to the struggle for a clean and sober life." Motherhood, however, helps keep the actress focused on the positive. "The kind of parent I will be is a good, present parent," she's said of raising daughters Olive and Frankie.

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KELLY OSBOURNE

Obourne's famous parents checked her into rehab in 2004 after discovering that she was addicted to prescription painkillers. "Towards the end, there wasn't a second in a 24-hour day that I wasn't high on something," she later admitted in a British TV interview, blaming her dependence in part to adjusting to life in America. Five years later, she returned to rehab – and emerged with a new outlook. "I'm getting a second chance and I want to be present for it," she told PEOPLE.

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GERARD BUTLER

Suffering a major surfing injury while filming Chasing Mavericks in 2011, Butler found himself at the hospital – and soon after, reliant on prescription painkillers. So in early 2012, the actor checked himself into the Betty Ford clinic for three weeks, and also revealed past struggles with alcohol.

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MATTHEW PERRY

The Friends star had a very public battle with addiction, going to rehab in 1997 and 2001 for drug and alcohol addiction and heading to the hospital in 2000 for alcohol-related pancreatitis – all at the height of his show's popularity. "It was terrifying," said Friends executive producer Marta Kauffman, "watching someone you care about in so much pain." In 2011, he returned to rehab for a short time to "focus on my sobriety and to continue my life in recovery," he said.

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NICOLE RICHIE

After being arrested for heroin possession in 2003, Richie headed to rehab to clean up her act. However, in 2006, under the influence of Vicodin and marijuana, she found herself driving the wrong way on the freeway – and facing jail time. About a year later, though, she announced she was pregnant with her first child – and sober. "I'm in a completely different place right now," she told Diane Sawyer. "I owe the baby my life."