John Mulaney has reportedly checked into rehab.

John Mulaney and Annamarie Tendler

John Mulaney and Annamarie Tendler

The 38-year-old stand-up comedian attended a rehab facility in Pennsylvania over the weekend amid his struggles with alcohol and cocaine addiction.

A source told the New York Post newspaper's Page Six column: "John’s friends and family are happy that he’s finally getting some help and focusing on his health."

The comedy star - who is is best known for his work as a writer on 'Saturday Night Live' - has previously spoken candidly about his addiction struggles.

And according to the source, his issues have resurfaced during the coronavirus pandemic.

The insider explained: "His fans know he’s struggled in the past with sobriety, he has talked about it openly. Unfortunately he has struggled again during the pandemic.

"He’s on board with his recovery, he’s not fighting against rehab."

Last year, John revealed he started drinking at the age of 13.

The comedian suggested that alcohol made him feel more confident and more humorous.

Speaking about his alcohol troubles, he shared: "I drank for attention. I was really outgoing, and then at 12, I wasn’t. I didn’t know how to act. And then I was drinking, and I was hilarious again.”

However, after years of excessive drinking and drug use, John decided to address the issue in 2005, when he recognised his life was spiralling out of control.

The stand-up star - who is married to make-up artist Annamarie Tendler - stopped "rooting" for himself because of his addiction issues and at the age of 23, he realised he needed to change his lifestyle.

John previously recalled: "I went on a bender that weekend that was just, like, fading in and out of a movie … It was just crazy … I was like, ‘You’re f****** out of control. And I thought to myself, ‘I don’t like this guy anymore. I’m not rooting for him.'"