Justin Bieber is back in the states, (still) showing off his abs, driving his luxury rides and angering his high profile neighbors in the process. The Biebs has been on an unofficial crash course in celebrity bad behavior as of late, with his most recent incident surrounding his driving skills, and an ex-NFL player.
Former wide receiver Keyshawn Johnson reportedly chased Bieber down (for speeding, ironically) Sunday (May 26). Johnson saw Bieber zipping through their Calabasas, CA, gated community, so the one-time athlete decided to take action.
Several neighbors also witnessed Bieber — allegedly high on weed — driving dangerously fast in his sports car, which could've caused some real damage, or even killed someone.
After dropping off his child, who was riding in the car, Johnson jumped back into his Toyota Prius and attempted to confront the 19-year-old.
Bieber was rolling in a Ferrari at the time and hightailed it to his mansion, but Johnson was still on his trail. Once in the singer's driveway, the 40-year-old blocked Bieber's car and tried to speak to him. Rather than confront the situation head on, Bieber ran inside and refused to come back out.
Given their weight difference Bieber may have had good reason to run away. The Canadian transplant is 5-feet 7-inches and weighs much less than that of Johnson, who stands at 6-foot 4-inches and 212 pounds. 

Causing a neighborhood disturbance, and/or possibly endangering residents was the running theme for Bieber's Memorial Day weekend. Aside from thwarting a potential altercation with Johnson, at least two different people called the cops on the youngster, dispatching authorities to his $6 million estate.

Bieber hasn't responded to the speeding allegations. According to Twitter, he's "focused" and working on new music.

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(Photos from left: Palace Lee, PacificCoastNews.com, Frederick M. Brown/Getty Images)