The singer reportedly punched a dude in the face after the guy allegedly grabbed a woman by the throat at a Coachella party.
Justin Bieber demonstrated he's not afraid to get his hands dirty when the good samaritan stepped in to deliver a message with his fist after witnessing a violent attack against a woman during a Coachella party.
According the the source, an unnamed woman was grabbed by the throat by an angry ex-boyfriend type at a Coachella-related party and her abuser wouldn't let go.
He was soon arrested by police but, oddly enough, cops say the woman at the centre of the brawl has "declined to press charges for the alleged battery and had no visible injuries at the time of police contact".
Eventually, though, Bieber hit the man in the face, and pushed him against the wall.
The insiders also added that the guy suddenly grabbed the woman by her throat and refused to let go. He was then seen chasing an SUV because he believed Justin Bieber was inside. A day earlier, Justin, 24, happily posed for a selfie with 11-year-old internet sensation Mason Ramsey - known as "yodelling kid".