Justin Bieber -- Pleads Guilty in Ontario ATV Assault, Eh

Justin Bieber just copped a plea in a criminal assault case involving Selena Gomez, a paparazzo and an ATV.

Justin appeared in a Canadian court via Skype. The singer was in the office of his lawyer, Howard Weitzman, when he pled guilty to simple assault and careless driving.

The incident went down in Ontario last summer, when Justin crashed his ATV into the minivan of a photog, who was taking pics of Justin and then-GF Selena.

The judge warned the Biebs, "The lesson in all of this is to think before you act in the future."

The plea was a good deal for Justin. He has to pay a $750 fine and that's it. There's no jail, no probation. The whole thing goes away.

Bieber's lawyer, Brian Greenspan, tells TMZ he worked with prosecutors to hammer out the deal, which he described as fair. He was quick to point out that no one was injured in the incident and the pap involved in the incident later pled guilty to trespassing.