Justin Bieber, King Kevi UPDATE: Biebs Denies Friendship, 'BFF' Files Restraining Order Against 'Vengeful' Singer, Tweets Cell Number to Beliebers 'Threatening to Kill'

Justin Bieber fans might remember King Kevi as the freeloading (aspiring) rapper who once insisted that he was the "Believe" crooner's best friend. Turns out that the Biebs has never actually even met Kevi... the bromance was a total lie. But according to Kevi (real name, Kevin Pederson), Bieber's just trying to save some face. In fact, the 19-year-old recently tweeted out Kevi's cellphone number as an act of revenge... and now several loyal Beliebers won't stop threatening to kill. TMZ reports that Kevi even filed for a restraining order against the Biebs... he regrets that they were ever "pals" in the first place. Yup, that's really happening... read on for more details!

Here's some background info on King Kevi's current sitch, as originally reported by Mstars:

King Kevi made headlines earlier this year for "shacking up" with Bieber as he tried to jump-start his own music career. He even apparently attempted to "romance" Selena Gomez AND Kate Upton:

Justin Bieber's Rap Pal King Kevi 'Kissing' Kate Upton, Debunks Selena Gomez Rumors? PHOTOS: Party, Smoke Hookah, Sexy Model 'Not Dating' Diddy

Justin Bieber 'All Around the World' Music Video, Beliebers Approve: Selena Gomez 'Hangs' with King Kevi and Friends, Driving Jealous Biebs Crazy?

King Kevi sat for a full exclusive interview with RadarOnline on Thursday (June 13) while in rehab for his addiction to "Sizzurp" - he claims he was the "party ringleader" of Bieber's posse. "I'm the main party guy in the group... [the] ringleader for getting it for everybody, because I had the hookup." Apparently Kevi used to bring "60-70 girls" to the parties he threw at Bieber's house, and "Justin started liking that."

Now that he's in rehab, the Biebs remains a close, supportive friend.

"I talk to him everyday... He actually sent me some new headphones," Kevi says. "He sent me a necklace too that's dope with diamonds and gold on it."

As for "hooking up" with the "Spring Breakers" beauty, Kevi wouldn't comment. He does say he might not be spending much time with Biebs in the future, "Justin's not really supposed to be seen with me."

But according to Gossip Cop, all of this is a total lie. Bieber apparently doesn't even know King Kevi!

One of the singer's reps reveals that he "never met him before... [Bieber] doesn't know who he is."

Kevi's "bromance" with the Biebs was all staged. The insider believes Kevi might be totally "delusional" - even a "complete liar."

Gossip Cop confirms that several L.A. clubs banned King Kevi after he demanded VIP treatment by dropping Bieber's name... even at times when the singer was out of the country.

Now there's this alleged restraining order against Bieber...

According to TMZ, 20-year-old Kevi recently filed a request for a restraining order against the pop singer, claiming that Bieber tweeted out his cell number on June 13th to his over 40,000,000 Twitter fans. Kevi believes it was an act of revenge for telling the media that they were close bros.

Apparently Bieber deleted the post several minutes later... but not in time to stop angry Beliebers. Since the tweet, Kevi has received "thousands" of death threats - he fears for his safety and his life.

So now, Kevi wants the Biebs to stop tweeting and contacting him... he also wants Bieber's crazy posse to stay at least 150 yards away from him at all times.

Meanwhile, Bieber's reps insist the teen heartthrob never sent out such a tweet.

Hmm... what side do fans believe?