He found himself thrust into the center of the Harvey Weinstein sex scandal after One Tree Hill actress Hilarie Burton revealed he groped her breast during an appearance on Total Request Live in 2003.

And Ben Affleck hid behind dark sunglasses as he was pictured arriving at a rehabilitation recovery center in Los Angeles for the second time in a week on Wednesday.

The actor, 45, stepped out as he issued a public apology to Burton, 35, for his behavior via his Twitter page.

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Apologies: Ben Affleck hid behind dark sunglasses as he was pictured arriving at a rehabilitation recovery center for the second time in a week on Wednesday

In the tweet about Hilarie, Ben wrote: 'I acted inappropriately toward Ms. Burton and I sincerely apologize.'

His apology comes just hours after Burton revealed he groped her when she was just 21.

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Twitter user @ShaniceBrim then tweeted about Ben: 'He also grabbed Hilarie Burton's breasts on TRL once. Everyone forgot tho.'

Hilarie, 35, responded: 'I didn't forget.'

Speaking out: Before his tweet, Ben was seen heading inside a recovery center in Los Angeles

Speaking out: Before his tweet, Ben was seen heading inside a recovery center in Los Angeles

Stepping out: The revelation came after Ben spoke out condemning Harvey Weinstein following the sexual harassment claims

The star, who is currently expecting her second child with her partner Jeffrey Dean Morgan, was 21 at the time of the incident on TRL.

Shanice tweeted back: 'I'm so sorry that happened to you. It's infuriating that people never bring up all the gross, predatory things he's done.'

Hilarie said on Twitter: 'Seriously, thank you for that. I was a kid.'

Shamed: The actor, 45, stepped out as he issued a public apology to Burton, 35, for his behavior via his Twitter page

The moment: His apology comes just hours after actress and former TV personality Hilarie Burton claimed he groped her; pictured during the alleged incident on a 2003 episode of TRL

Flashback: Soon after, a Twitter user @ShaniceBrim tweeted: 'He also grabbed Hilarie Burton's breasts on TRL once. Everyone forgot tho'

The Twitter user told the star: 'I remember when that happened and never forgot about it. We see you,' adding a heart emoji.'

Hilarie wrote: 'Girls. I'm so impressed with you brave ones. I had to laugh back then so I wouldn't cry. Sending love.'

She also shared link to a video from an interview she did about the incident.

The reveal: The groping incident came to light after a Twitter user spoke about it on Wednesday morning

Happier times: Hilarie is expecting baby number two with her longtime partner, Jeffrey Dean Morgan; seen together at the Primetime Emmy Awards on September 17 in LA

Hilarie is heard saying in the clip: 'He wraps his arm around me and comes over and tweaks my left boob.'

Another bit of the footage has Ben, who was about 31 at the time, say to her: 'how old are you - 19?'

The revelation came after Ben spoke out condemning Harvey Weinstein following the sexual harassment claims.

The actor, a protege of Weinstein, posted a message on his Facebook account on Tuesday, writing that he is 'saddened and angry that a man who I worked with used his position of power to intimidate, sexually harass and manipulate many women over decades.'

Didn't see that coming: Ben took to Twitter to condemn Harvey Weinstein for his alleged sexual assault and harassment scandal, which ended up turning on him last week

The actor is currently in a relationship with Saturday Night Live producer Lindsay Shookus.

Lindsay, 37, was seen on Wednesday morning heading to the gym in New York City.

Ben is focusing on his sobriety after a rehab stint in February; he went public with his alcohol addiction in March.

The Forces Of Nature star was reportedly seen at an outpatient treatment last week.

According to US Weekly's source, Ben looked 'happy' as he went inside, adding that he 'looked refreshed' and 'in a good mood.'

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In March, he announced on Facebook that he had entered and completed treatment at a program.

Meanwhile: His girlfriend Lindsay Shookus stepped out in New York City while heading to the gym; seen on Wednesday

Out and about: The 37-year-old Saturday Night Live producer kept it casual in leggings and a grey turtleneck top

Ben wrote in a post: 'I have completed treatment for alcohol addiction; something I've dealt with in the past and will continue to confront. I want to live life to the fullest and be the best father I can be.'

'I want my kids to know there is no shame in getting help when you need it, and to be a source of strength for anyone out there who needs help but is afraid to take the first step.'

'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.'

'This was the first of many steps being taken towards a positive recovery.'

Ben and his estranged wife actress Jennifer Garner are parents to three children: Violet, 11; Seraphina, eight; and Samuel, five.

Real talk: In March, he announced on Facebook that he had entered and completed treatment at a program