We didn't know he was THIS popular!

Thousands of fans gathered for an impromptu memorial for dead rapper XXXTentacion in the streets of West Hollywood last night, and the tribute got so rowdy police were called in to help manage the crowds.

Some people were climbing on cars and jumping off buildings in honor of the murdered hip hop star, and photos and video of the event rapidly started popping up on social media.

The 20-year-old was gunned down outside a motorcycle dealership in South Florida on Monday... or was he? Crazy new conspiracy theories are going around that the rising star faked his own death as a publicity stunt! They claim there were no bullet holes and no blood at the crime scene, and they really believe he's still alive.

As for who is suspected of killing the Soundcloud lyricist? Well, both Soldier Kidd and Soldier Jojo have denied that they were the gunmen, and some fans even think Drake is the culprit, as the "Hotline Bling" crooner and X had beef after the chart topper reportedly ripped off one of his songs and made it his own. That seems pretty far-fetched!

We caught up with Lil' Xan yesterday in Beverly Hills, and this is what he had to say about XXX's untimely passing...