"Castle" star Stana Katic and her husband are getting harassed so viciously they've had to call in the LAPD.  

Law enforcement sources tell us Katic's husband, Kris, went to police to report an IG user who'd been leaving nasty comments on Stana's social media. We're told some of the comments read, "Kris, I hope you die" and "I wish cancer on you and your family."

Our source says the harassment started in October, but things got really bad in February when the suspect started making nasty comments about extended family members and their dog by name. Stana and Kris are worried because those names aren't listed publicly.

Cops tell us they've determined the suspect is out of country, but haven't made contact with him yet.

Travis Scott has more colors coming out of his mouth than a kid downing a bag of Skittles ... thanks to his very unique tricked out grill. 

We found out Travis enlisted celeb grill master Johnny Dang to whip up his 18 carat gold piece which is filled with 10 carat pink, brown, blue and white diamonds! Travis plans to unveil his multi-colored mouth during his upcoming Anti World Tour dates with Rihanna.

Travis dropped $25,000 for the grill ... which had to be shipped overnight for a show this week.

Mouth stunna!

Brand new for my brother @travisscott #grillsmaster #diamondboyz

A video posted by Johnny Dang (@tvjohnny) on Mar 26, 2016 at 11:52am PDT

Zero Kazama, host of MTV's "Silent Library," is now a wanted man after dodging a court appearance related to a bizarre incident where cops say he terrified tourists with death threats. 

According to court records, obtained by TMZ, Kazama had a date with a judge on March 28 -- for DUI and misdemeanor assault charges -- but was a no-show, so the court issued an arrest warrant. 

We broke the story ... Kazama went to the Manitou Springs Cliff Dwellings in CO a couple months ago, and began yelling everyone was going to die. He split before cops showed up, but was apprehended later when he crashed his car and got busted for DUI.

Vince Vaughn looks so money!

Here’s a 26-year-old version of the actor at the premiere of his breakout movie "Swingers" in 1996 (left) and 20 years later ... the comedic genius – who celebrated his 46th birthday earlier this week – at a party last month (right).

Aging like a champion!

The question is …

Sting has officially retired from pro wrestling ... making his announcement at his WWE Hall of Fame ceremony, just as TMZ Sports said he would. 

We broke the story ... the wrestling legend messed up his neck real bad at his "WWE Night of Champions" match against Seth Rollins back in September -- and was never able to recover.

Sources connected to Sting tell us he was evaluated by several doctors who all agree -- it's just too risky for the wrestler to get back in the squared circle ... so, he's decided to hang up his singlet. 

Well, he made it official tonight ... saying, "On this very night, at this very moment ... I'm going to finish my wrestling carer under the WWE umbrella ... and I am so proud of that."

"I am officially going to retire tonight."

He added, "I just want you to know this isn't goodbye, it's just see ya later."

As we previously reported, Sting is open to a non-physical role with the WWE -- but so far, it's unclear if the two sides have been able to hammer out a deal. 

#CongratsSting #HelluvaCareer

Newly inducted into the @WWE Hall of Fame, @STING announces his retirement from the ring. #WWEHOF #ThankYouSting https://t.co/5ru7YswgVI

— WWE (@WWE) April 3, 2016

Amber Rose gets called out for copying Kim's emojis, Lamar Odom is back on the sauce and Nick Young admits to cheating on Iggy. So we gotta ask ...

"Trailer Park Boys" star Bubbles' arrest has clearly caused a rift among the show's cast ... and now one of female stars has quit.

Lucy DeCoutere who plays Lucy on the show tweeted Saturday, "If I find out that somebody is abusive, I cut them out of my life. it's very easy." A few hours later she wrote, "I have resigned from Trailer Park Boys."

The announcement comes just a day after TMZ broke the story of Mike Smith's arrest. According to witnesses, Smith got physical with a female after an argument at The Roosevelt Hotel in L.A.

According to a Canadian report, the show's publicist claims Lucy made it know a few weeks ago she would not be returning for TPB's next season. 

Miranda Lambert isn't being shy about moving on from Blake Shelton -- she's sticking close to her new boy toy in Las Vegas, where it's likely they'll bump into Blake ... and maybe even Gwen Stefani. 

Sources at the Academy of Country Music Awards say Miranda's been parading around singer Anderson East all weekend, and introducing him to everyone as her "boyfriend."

That's not surprising, they've been together for a few months, but It's interesting because her ex, Blake will also be at the ACMs. Far as we can tell, this is the first time she's brought Anderson into a situation like that.

Both Blake and Miranda are scheduled to perform at the award show Sunday ... and we're told there's a chance Gwen will be in the audience supporting her guy.

It's a country song just waiting to happen.

Marvel fans rejoice ... images have finally surfaced of Benedict Cumberbatch in full costume as Doctor Strange.

Photogs caught Cumberbatch in action Saturday in Manhattan ... and by the looks of things, the cape doesn't seem to slow him down at all. 

That's not all ... Chiwetel Ejiofor who plays villain Baron Mordo in the comic made an appearance too.

Talk about a nerd-gasm. 

Mariah Carey wants to make something very clear -- her ex-staff members didn't walk out on her ... she showed them the door, and she couldn't be happier about the changes.   

Mariah tells TMZ ... “I dismissed a majority of my team because I discovered that they didn’t have my best interests at heart. My new team, including manager Stella Bulochnikov are the top of the line in the entertainment business and more importantly in my life and I am now much more financially successful and more organized than in the past."

Mimi made sweeping changes during the last month. There were reports several former staffers quit, but MC says she's the one who pulled the trigger. One of her reps tells us they now have procedures in place to make sure everyone on the team puts Mariah's interests ahead of their own.

Mariah's digging the new system. She says she's loving shooting her musical documentary right now while touring Europe, and adds ... "My fiancé James Packer just came to visit me in Denmark. And he had no problem being on camera for the show with me…and we had a great time.”

THAT is a (multi) billion dollar grin.

Erin Andrews got her guard up at LAX when a taxi driver started recording video of her.

It all went down Friday afternoon after Erin landed in L.A. -- and you'll see in this clip ... she was fine talking to our camera guy and with a nearby still photographer.

But the "Dancing with the Stars" and FOX Sports host is clearly still on edge about video cameras she's not expecting -- after her whole hotel room peephole ordeal. 

Watch, seems like Erin's cool with everyone playing their role -- but the taxi driver shooting freaked her out ... and it ended up costing him.

Kato Kaelin, who was a witness in the O.J. Simpson murder case isn't a John Travolta fan ... at least not when it comes to playing O.J.'s lawyer.

Kaelin appears on this week's episode of Matt Weiss and Theo Von's "Allegedly" podcast and dishes on what he thinks about "The People v. O.J." Kato praises Courtney Vance for a spot-on Johnnie Cochran but says when it comes to Robert Shaprio, Travolta could use some work.

Kato also talks about the auction for the suit he wore during the O.J. trial ... dude's not happy about that either.

Take a listen to the whole clip to find out who Kato thinks is trying to make a quick buck off the suit. You can download the full podcast here when it comes out Tuesday.