The Kim Kardashian robbery reeks of an inside job ... sources say that's what Paris cops think.

Sources involved in the case tell us ... police and the Kardashian family don't believe it was a coincidence that Kim was bodyguard-less at the time the robbers showed up and somehow made their way into her apartment ... they think the robbers were tipped off it was the right time to strike. 

There was a very small window when the robbers had easy access. Kim had friends over until shortly before the incident went down. Kim's bodyguard was always by her side -- to the point Kim joked that it got annoying -- except for the few hours he left to protect Kourtney and Kendall in a nearby nightclub. 

The Kardashians are in no way suggesting the bodyguard was in on it ... in fact, they say they know he wasn't. But they are convinced someone tipped off the robbers to strike at precisely the moment they could get in and out without detection.

As we reported ... robbers confronted the concierge at gunpoint in the lobby and he let them up to Kim's unit. We're told when the robbers left with the jewelry, they took the concierge back downstairs.

We're told if there was a tip-off person, there's a long suspect list ... there are multiple units in the building and lots of people involved in Paris Fashion Week knew Kim's comings and goings. 

Our sources say cops are in the process of checking phone records of various people in and around the building to track suspicious activity.

Ben Stiller is revealing his prostate cancer diagnosis, and delivering an important message for men -- don't avoid your doctor's finger ... 'cause it could save your life.

Ben went on "The Howard Stern Show" Tuesday ... speaking publicly for the first time about discovering the prostate cancer 2 years ago. He says he beat it after undergoing surgery.

But Ben really wanted to get into the big debate about when to get tested and what kind of test to take. He shared his experience -- in detail -- and believes it could help you.

Check out the clip ... important stuff, but entertaining too.

2 Chainz deserves the best and won't settle for anything less, and to prove it ... he shamed the hell out of a paparazzo at LAX.

We caught up with the rapper Monday, and before we could ask him a question he went HAM on a photog -- not ours -- for daring to show up with a camera that wasn't up to snuff ... in 2 Chainz' book, anyway.

Check out the vid ... sounds like he's got a side gig with the Geek Squad!

Also, Chainz shouts out Shawty Lo and his awesome funeral pit stop at an ATL strip club ... and then took another pot shot at the photog.

Cuba Gooding Jr. doesn't think there are racial overtones when he's mistaken for Terrence Howard.

Cuba was leaving Craig's in WeHo Monday night when he weighed in on the Television Academy mistaking Terrence for him in a tweet this year at the Emmys.

One other thing he makes clear ... he doesn't need Lady Gaga to score Super Bowl tickets.

Rob Corddry says he would blindly trust tattoo artist Scott Campbell with his own skin ... blindly. 

We got the "Hot Tub Time Machine" star at LAX where he showed us his newest tat from Scott himself. He fesses up ... he didn't stick his arm in Scott's famous tattoo glory hole ... not to say he wouldn't do it.

Scott's done tats for the likes of  Howard Stern and Robert Downey Jr. after all ... not to mention his wife, Lake Bell.

Check out the clip -- Rob's confident in Scott's judgment ... no fear of broner tats here.

Jim Jefferies knows what Kim Kardashian's going through right now, because he was tied up and robbed in a violent and remarkably similar crime.

We told the Australian comedian at LAX about Kim's Paris ordeal and his surprisingly nonchalant response was ... oh yeah, that happened to me once.

Jim says it went down 12 years ago in the U.K., and although he wasn't trying to one-up Kim ... you gotta see what he says about the machete. You'll understand why he's been wary of going back there.

There's one other thing he and Kim have in common. Watch, he might have been kidding.

Julian Edelman's baby mama only rolls with the best ... Exhibit A -- the insanely hot guests who attended her baby shower over the weekend.

Ella Rose was surrounded by about 30 smoking hot friends -- seriously, the group shots look like a modeling agency's Christmas party. Makes sense 'cause most of 'em are models, like Abigail Ratchford who hosted in her Bev Hills pad.

We're told the shindig cost about $10k, and some of that was even spent on food, including ham and cheese croissants and mini beef wellingtons.

No photo proof of them actually swallowing, but plenty of other fun pics ... enjoy!

Kanye West isn't leaving his wife's side just yet -- he's pulled the plug on 2 upcoming concerts, including Tuesday's in Philly, rescheduled for Dec. 13

Take it as a sign of just how shaken Kim Kardashian was by the armed robbery in Paris -- Kanye postponed the Philly show and Thursday night's gig in Detroit will now take place Dec. 22

Kim flew back to NYC Monday morning after the ordeal, and Kanye -- with an army of bodyguards -- has been locked down with her ever since. 

Janice Dickinson can no longer brag about dating a doctor, because the man she's set to marry just surrendered his license ... TMZ has learned.

Psychiatrist Robert Hugh Gerner allegedly engaged in a sexual relationship with a female patient from 2004 to 2011, and even lived with her during the last 3 years, according to docs filed in the case.

All that was before he started dating Janice, but the bigger problem is breaking the code of ethics. The California Medical Board filed a complaint against Gerner in 2015, and he waved the white flag in June of this year.

It isn't the first time Dickinson's fiancé has been through something like this. According to docs, he was suspended for 60 days in 1994 for sexual misconduct with another patient.

We reached out to Gerner's people, but so far no word back.

Danny Trejo is known for being a badass on the big screen ... but he's becoming more and more popular for serving badass tacos to hungry Los Angelenos.

We got Danny at LAX -- just in time for National Taco Day -- and he says business is so awesome at his Trejo's Tacos restaurant, he's about to open a second one.

And if you're looking for a bonus side order to go with your eats ... Danny's gonna make you an offer you can't, or shouldn't, refuse. Check it out.