Ben Affleck revealed his dramatic weight loss on Monday after a stint in rehab.

The 46-year-old actor was barely recognisable as he walked around Los Angeles dressed in tracksuit bottoms, a grey hoodie, sunglasses and a beanie hat pulled over his ears.

Ben’s Nike trousers hung off his hips and the star, who has reunited with his ex-girlfriend Lindsay Shookus, sported a grey beard.

The Hollywood star split with Lindsay last summer and headed into rehab when ex wife Jennifer Garner staged an intervention.

But he was spotted with the TV producer at a Starbucks on Saturday and a source told ET: “They are hanging out again. They have been for over a month now.”

The Batman actor headed for treatment last year after his wife of ten years went to his LA home and begged him to get help, TMZ reported at the time.

Witnesses said Jen arrived with “a lawyer and a Bible” and they left together after talks at his $27 million mansion.

Ben knew he needed help and wanted the treatment and was driven to the Canyon live-in rehab facility in Malibu.

Friends of Ben told Page Six he’d been in a bad place since breaking up with Lindsay.

An insider said: “He’s having a tough time. It’s unclear what his relationship is with Lindsay and he still has his relationship with Jen.

“It’s not easy and he’s struggled with staying on a straight path before.” Oscar winner Ben has been to rehab for alcoholism twice before — once in 2001 and in March 2017.

TMZ claimed Jennifer became worried for Ben last summer after pictures emerged of a huge delivery of alcohol arriving at his home just two days earlier.

The couple separated in 2015 after ten years of marriage and have three children together.

The website said “Ben fell off the wagon a while ago and it’s got progressively worse” and that actress Jennifer drove Ben to an LA rehab, only stopping off at fast food restaurant Jack In The Box.

He later took to Instagram in October, after spending 40 days in the facility, and updated fans on his struggle.

Ben wrote: “This week I completed a 40-day stay at a treatment centre for alcohol addiction and remain in outpatient care. The support I have received from my family, colleagues and fans means more to me than I can say.

“It’s given me the strength and support to speak about my illness with others. Battling any addiction is a lifelong and difficult struggle. Because of that, one is never really in or out of treatment. It is a full-time commitment. I am fighting for myself and my family.”

He added: “So many people have reached out on social media and spoken about their own journeys with addiction. To those people, I want to say thank you. Your strength is inspiring and supporting me in ways I didn’t think was possible.

“It helps to know I am not alone. As I’ve had to remind myself, if you have a problem, getting help is a sign of courage, not weakness or failure. With acceptance and humility, I continue to avail myself with the help of so many people and I am grateful to all those who are there for me. I hope down the road I can offer an example to others who are struggling.”

After splitting from Lindsay, The Justice League star was snapped with stunning Playboy model Shauna Sexton, 22.

The pair shared a meal as Ben celebrated his 46th birthday at Nobu in Malibu.

Meanwhile, Jennifer’s star was unveiled on Hollywood’s Walk of Fame last year.

The pair have son Samuel Garner, six, plus daughters Seraphina Rose Elizabeth, nine, and Violet Anne, 12.

BEN’S ROAD TO RECOVERY

2001: First time in rehab

After a night of ‘hard partying’ Ben was driven to Promises Rehab in Malibu by his friend Charlie Sheen. He stayed for 30 days and his rep confirmed: “Ben is a self-aware and smart man who has decided that a fuller life awaits him without alcohol.”

2004: Marriage to Jennifer Garner

The pair got married after meeting on the set of Daredevil and have their three children. Insiders say she is a “positive influence” and he says: “I think becoming a father makes you see the world differently and it’s good. When you’re a young man in your 20s, part of that is making mistakes and learning from them. I just made those in front of everybody, rather than privately.”

2012: He reveals his dad’s struggle with alcohol

Ben tells US TV host Barbara Walters that his father suffered from alcoholism. “He was an alcoholic. I did know that as a child. He drank a lot. My father was a — what did they call him — a real alcoholic. He, you know, drank all day, drank every day, and to his credit, he got sober ultimately. He’s been sober for several decades, which I think is pretty impressive.”

2015: Split with Jennifer

Ben and Jen shocked everyone by announcing they’re splitting up. US reports claimed that Jennifer and Ben ended their marriage after he started a relationship with their children’s nanny — something Jennifer later clarifies had “nothing to do with our decision to divorce”.

2017: Second trip to rehab

Ben announced he had recently been to rehab for alcohol issues, saying: “I have completed treatment for alcohol addiction; something I’ve dealt with in the past and will continue to confront. I’m lucky to have the love of my family and friends, including my co-parent, Jen, who has supported me and cared for our kids as I’ve done the work I set out to do.” The former couple finally file for divorce in April 2017 and later that year, it’s revealed Ben is dating Saturday Night Live producer Lindsay Shookus.

2018: Split with Lindsay

In June 2018, Ben and Lindsay were spotted at lunch with her parents in LA, but by August it was all change. Ben was spotted out with Playboy model Shauna Sexton. Lindsay is seen by paparazzi returning Ben’s car to a parking garage near his house.