EXCLUSIVE: TRUMP STAR VANDAL COULD GET 3 YEARS IN JAIL…D.A DROPS HAMMER

The guy who trashed Donald Trump's Hollywood star just got slammed with a felony vandalism charge ... and he could end up behind bars for a while. 

The L.A. County District Attorney's Office finally charged James Otis on Thursday with one count of felony vandalism for taking a pickax to Trump's star on the Hollywood Walk of Fame last month. Otis recorded video of himself doing the deed... so this is as close to 'open-and-shut' as you're gonna get.

We broke the story... Otis said he defaced Trump's star to stand up for the President-elect's alleged sexual assault victims, and that he was happy to go to jail for the crime.

Careful what you wish for -- he's now facing up to 3 years in jail and a $10,000 max fine if he's found guilty.