First and foremost you need to know "what the hell are hollywoodian style beards", a simple answer is that it's one of the most clean cut beard styles you can have. It's a full facial beard with disconnected sideburns and a cleaned neckline. The trick of this style is that you have to be precise and understand the shape of your face, one wrong move could make the hard work you put into trimming your beard a complete accident or the fact that your buddies pulled a practical joke on you when you were sleeping.
For instance take a look at Leo, even with unmaintained beard the fact that it's disconnected gives him the appearance that it's purposeful. The main reason why if you go to a large corporate office you will most likely see this style of beard.
How Do You Trim It?
1. Shave the sideburns from exactly halfway down the ear to the top of the jawline (either razor or trimmer depending on closeness desired).
2. Clean cheek line with a razor while outlining the beard shape.
3. Clean the neckline with razor or trimmer.
It's a very simple process and the key is to make sure you don't shave your sideburns too high or your beard too low.