Justin Bieber says he’s ‘not to be f—ed with’ in strange Father’s Day post

Don’t mess with Justin Bieber.

The “Sorry” singer, 31, had a blunt message for his fans as he celebrated his first Father’s Day on Sunday.

“I’m a dad that’s not to be f—ed with,” Bieber wrote alongside a black-and-white selfie.

In the close up-image, Bieber stared at the camera while wearing a beanie and a sweatshirt.

The Grammy Award winner included middle finger emojis in his caption and in the corner of his selfie.

Bieber became a dad in August with the birth of his and Hailey Bieber’s son Jack Blues.

On Thursday, Bieber had a heated confrontation with a paparazzo wishing him a happy first Father’s Day outside Soho House in Malibu, Calif.

The “Baby” singer told the paps to “get out of [his] f–-ing face” and “stop asking [him] how it’s going.”

“I’m a father. I’m a dad, and you guys are on private property in front of my car,” he said.

Then when one pap wished him a happy early Father’s Day, Bieber angrily responded, “I don’t know you. You don’t go to people you don’t know and say s–t out of nowhere with a camera in their face. It doesn’t matter if I’m a celebrity or not. It doesn’t matter if I’m a public figure.”

The day after the incident, Bieber shared never-before-seen photos of the pop star with his son Jack in a post that he captioned with a middle finger emoji and the phrase “ay bay bay.”

Bieber’s fans have grow increasingly concerned about his mental health over his continued series of cryptic posts that he’s shared on social media.

Last week, he took to Instagram to complain about “transactional relationships” after Hailey, 28, sold her Rhode beauty brand to Elf Beauty for about $1 billion.

“Tired of transactional relationships,” he declared. “If I have to do something to be loved. That’s not love.”

On his Instagram Stories, Bieber elaborated, “This is how I feel after people keep telling me there’s more work to do after I’ve given everything I have to give. I don’t think any of us can handle hearing, ‘You just gotta try a little harder and you will be like me.’ It’s not true.”

Back in Feb., Bieber rapped about being “high” as a friend smoked cigarettes next to him in a video. The following month, he shared a message about feeling like he’s “drowning.”

Despite concerns for his health, the singer’s rep previously shut down claims that he’s on drugs.

The rep told TMZ in Feb. that the speculation about Bieber is “exhausting and pitiful and shows that despite the obvious truth, people are committed to keeping negative, salacious, harmful narratives alive.”