He's bringing ViolentAggressionBack.

The Hollywood Grind has some great pics of Justin Timberlake freaking out and threatening to go postal when spotted by some friendly photographers arriving at a party in the Hollywood Hills last night.

His girlfriend, Cameron Diaz (who looks really rough in these pics, by the way) had to restrain him from trying to grab the Grind's cameras.

To make matters worse, the jackass proceeded to yell at these poor journalists to back off and to stop shooting pics, even though the scene was on public property (in the street).

Nice one, Justin! Good to see you think you're better than us!

Justin's mom, Cameron, Justin's cousin and business partner, Trace, and some of the rest of their entourage joined in and the photographer finally retreated. Apparently that wasn't good enough, as Camberlake has apparently filed a police report.

Wow, guys. Take a chill pill!