Justin Bieber warned fans not to mess with him while celebrating his first Father’s Day.

“I’m a dad that’s not to be fucked with🖕🏼,” the “Peaches” singer wrote via Instagram Sunday, alongside a black-and-white selfie of himself with a middle finger emoji.

The post received support from his wife, Hailey Bieber, who dropped a “like.”

“I’m a peaceful man, but mess with my kids and I cannot be held responsible for what will happen.

“This is a man that’s standing on business,” a second chimed in.

Other critics claimed Justin, 31, was “high as f–k.”

“i love you so much and i’m so worried about you king,” another added.

The hitmaker is the father to 9-month-old son, Jack Blues, whom he welcomed with Hailey, 28, in August 2024.

Justin appeared to be echoing the same message when he confronted paparazzi as he left Soho House Malibu in California on Thursday night.

“Not me today bro. How do you think it’s going with you in my f–king face? Get out of my f–king face!” he responded while shielding his face.

“Stop asking me how it’s going. Get out of here,” the pop star added. “I’m a real man with a real family … I’m not to be f–ked with by any of you.”

Justin continued to beg photographers to leave him alone as they were crowding around his vehicle.

“I’m at my wit’s f–king end is what I am at,” he continued, saying how he knew the paps would take the clip out of context, labeling it, “Justin lost his mind.”

The following day, the “Baby” singer appeared to send another message to the paparazzi with photos of himself holding his son, captioning it, “ay bay bay,” with a middle finger emoji.

Justin, who has sparked fan concern in recent months, also went off on paparazzi in April, saying he refused to be “bullied” into leaving Los Angeles.