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Riley Martin, one of the hosts on Howard Stern's Sirius XM channel -- and a regular on his main show -- has died at 69.

Riley's longtime producer, Eron, tells us Martin passed away in Bethlehem, PA a few days before Christmas. Martin famously claimed the Biaviian alien race abducted him several times. He stuck to his guns about that every time Howard, or anyone else, grilled him about it.

Eron wouldn't say what caused the death, but on his Facebook page he'd recently mentioned being in the hospital battling an ongoing illness. Eron posted a FB message to fans, saying Riley wanted them to know he will see them again in the future.

R.I.P. space cowboy.

NFL vet Shaun Smith set off a firestorm when he tweeted a photo of his handgun along with what sounds like a thinly veiled threat to his haters, but he says everyone's got him wrong.

The ex-Bengals and Chiefs defensive lineman says he was going back and forth with fans on Twitter about KC's upcoming playoff game, when things got a little heated. He tells TMZ Sports, "Everyone was talking all this macho stuff."

Marshawn Lynch is sidelined with an injury, but his Beast Mode brand is rolling like never before ... and it's all for a good cause.

Lynch teamed with McLoughlin Jeep in Oregon to create 24 limited edition "Beast Mode" vehicles for sale at the dealership ... with part of the proceeds benefiting Marshawn's charity -- Family 1st Foundation.

We spoke to Christopher Bevans -- who runs Beast Mode -- and he tells us each Jeep will "truly be one of a kind” ... patterned after Marshawn's own personal style.

Of course Lynch copped one for himself ... and it's tricked out with $100k worth of customization including premium leather, a high end paint job and an "insane" sound system.

BTW, if you're wondering how much Lynch's custom ride set him back ... it was the low, low price of ON DA HOUSE.

How does a guy who bashes people's faces in for a living bond with his family over the holidays?

If you're UFC superstar Anderson Silva ... SIMULATED WARFARE!!!

Silva -- currently training for a big fight against Michael Bisping on Feb 27 -- took 12 family members out to Hollywood Sports in Bellflower, CA this past Saturday for some yuletide paintballin' fun.

We spoke with the owner of HS ... who tells us Anderson is a frequent visitor and believes the time shooting at each others heads promotes family unity ... and helps work off all that turkey.

How hardcore is Silva about his paintball? We're told he owns his own custom-made military grade tactical gear ... and loves to compete on the "Saving Private Ryan" battle course.

Still ... he's one of the only guys we can think of who's more dangerous WITHOUT a gun.

LeBron James has joined Odell Beckham Jr. and James Harden in the seemingly never ending pro-athlete dance recital ... and he brought his whole team with him.

LBJ hit up INTL nightclub in Scottsdale, AZ Sunday night with Kyrie Irving, J.R. Smith and Iman Shumpert and the guys showed off the latest dance craze "Hit Them Folks" for the partygoers.

We're told the festivities lasted until about 1 AM ... and get this ... our spies say not one drop of alcohol was consumed by the ballers.

The Cavs play the Suns in Phoenix Monday night ... better get a win to go with all that cuttin' a rug.

Scott Disick and Chris Brown seem like a bad combo ... they've both struggled with substance abuse yet they've been hanging out ... but they claim they've actually become each other's support system.

We're told the 2 have become fast friends and have bonded over water ... and lots of it. Scott and Chris both insist that's all they drank when they went clubbing together a few days back at 1OAK.

They actually have a lot in common. Both of their baby mamas have called them out for drugs and/or booze and have threatened to get a judge to yank access to the kids.

We're told Chris has pulled back in a big way since Mia Guzman put him under under the microscope, and Scott's faced the same issues with Kourtney. It sounds weird and maybe it's a pipe dream, but they both think each can help the other stay strong and sober.

There's a side benefit for Chris ... the more time he spends with Scott and his crew, the less time his has for gangbangers.

The little things in life ...

Pittsburgh Steelers superstar Antonio Brown had an early Xmas gift for a local high school football team -- taking the entire squad to a screening of "Concussion" ... TMZ Sports has learned.

Brown hooked up the kids at Clairton High School in Pennsylvania -- a team he's essentially adopted since joining the Steelers.

Clairton head coach Wayne Wade tells us ... Brown organized a bus to take the players to a nearby theater and treated the kids to a night at the movies.

Wayne says Brown is always doing cool stuff for the high school -- "A couple years ago he paid for the whole team to go to Dave N Busters after the season."

So, why Clairton??

"He loves the whole small town, small team, small program thing. We are the winningest program in Pennsylvania, piled up 66 wins in a row (Pennsylvania record), won state championships."

Plus, Wayne played Arena League football with Antonio's dad.

So, what did we learn today ... people actually ARE going to see movies other than 'Star Wars.'

Drake Bell found himself behind bars Monday after cops busted him for driving under the influence.

Law enforcement tells TMZ the actor was driving in Glendale, CA when an officer saw him swerving and speeding after abruptly stopping at a red light. We're told Bell was driving 55 in a 35 and when cops pulled him over, they noticed a smell of alcohol coming from the car.

The kid who Kendrick Lamar plucked out of a crowd may become a big star, because Jas Prince, the guy who discovered Drake, happened to be in the crowd.

The lucky kid, who goes by Corporate Dough, got a false start when Kendrick pulled him onstage Sunday at the Day for Night festival in Houston ... he forgot the lyrics to Kendrick's song. But he went on to slay by freestyling his own lyrics.

Corporate Dough tells us, Jas Prince was so impressed he approached him and they exchanged information.

So far, no word from Jas Prince ... but meetings take a while. Good luck.

Raven-Symone couldn't get the real Kim Kardashian and Kanye West to celebrate with her for her big 30th birthday, so she opted for the next best thing.

Kim Kardashian broke the Apple app store.

Kim launched Kimoji's Monday -- Kim-themed emojis -- and the response was crazy. So many people tried downloading it at once, the Apple app store couldn't handle the tidal wave and started crashing.

At one point today it was getting 9,000 downloads per millisecond.

We're told the Apple tech team swooped in and shored it up so it didn't fully crash.

As for the app ... it will set you back $1.99.

Kim's teaching her little sister a lesson or 2 in apps.

Some parents in Virginia just pulled the ultimate "mic drop" on everyone else trying to impress their kids with "Elf on the Shelf" setups this year ... creating a Drake-inspired "Hotline Bling" display.

For those out of the know -- "Elf on the Shelf" is a recently started holiday tradition -- in the weeks leading up to Christmas where parents pose a toy elf overnight for their kids to find in the morning. Kristen Dipini from Dale City, VA tells TMZ she and her husband got extra creative for their 3 kids this year.

She tells us all of her kids love Drake and the "Hotline Bling" song so she set up "Elfis" just like his music video Sunday morning.

The pic has been going viral all day and it's no surprise ... Drake's just got it this year.

Teresa Giudice's Christmas as a free woman will be spent the Italian way ... with lots of family and antipasto.

The 'Real Housewives of New Jersey' star will be released from the big house on Dec. 23rd after serving a little under a year for fraud ... and we're told she doesn't want a big coming home party.

Sources tell us Teresa's going straight home once she's out to Joe and the kids.

On Christmas Eve, they'll make the trek over to sister-in-law and fellow 'RHONJ' star Melissa Gorga's house and Christmas Day will be spent with Joe's family. Teresa's hubby will begin his 41 month prison sentence soon ... so it's the last time they'll all be together for Christmas for a while.

We're told the plan is to capture everything on camera, but Bravo's still working out contracts and logistics so nothing's set in stone.

Selena Gomez didn't pull a Justin Bieber when she posted a pic of a smoking hot dude, 'cause she's not trying to get with him ... she's just promoting her new music video.

We're told the Wilhelmina L.A. model in the pic is Christopher Mason -- Selena slapped him up on her IG Thursday, and fans immediately thought she was either trolling Justin or trying to holla at some random babe.

Truth is, Christopher plays Selena's love interest in her "Hands to Myself" music video which drops next week. We're told there's no hooking up going on -- in fact, Chris is in a relationship. He also has a daughter.

That doesn't mean Selena's blind -- we're told she hand-picked him to be her co-star. Smart chick.

A couple of Arizona State football players got busted for burglary, and the excuses they gave cops live up to every ASU student stereotype you've heard.

Campus police say they caught Jayme Otomewo and Deonte Reynolds in the hallway knocking on an apartment door on Sunday afternoon. A female student had called police to report 2 unknown black men in her entryway without permission.

When police questioned Otomewo and Reynolds they admitted entering a couple of rooms, but said they were merely looking for a vacuum. Y'know how college kids love to clean.

Police suspect they used a butter knife to jimmy the doors because Otomewo had a bent one in his pocket. He told police it was there from the night before. He had no explanation for why it was still there the next day.

Cops say the guys also had several credit cards -- not in their names -- a Beats Pill portable speaker, 2 iPods and 1 iPhone. They claimed the cards belonged to friends. As for the speaker, cops say they were blaring music from it as they went room-to-room, and Otomewo admitted pilfering it.

Reynolds was booked for 2nd degree burglary, and Otomewo for theft and 3rd degree burglary.

Gooooo Sun Devils!

The Game can finally settle his beef with Stitches without risk of ending up in jail -- he has an offer to step into a boxing ring ... and Stitches has already signed on the dotted line.

Damon Feldman is promoting the celebrity boxing event and tells us the fight would be 3 rounds, each being 90 seconds long. After the Miami K.O. of Stitches ... Feldman thinks there's enough interest that the purse could be as high as 7 figures.

Game has said the fact he's on probation is why his pal Wack 100 stepped in to take down Stitches the first time, but a celeb boxing match would keep him on the right side of the law.

No date yet for the fight, and no word if Game will bite.

It's hardly a rematch since Stitches barely got a step in, much less a punch -- but we're told he's taking the opportunity seriously, and might hire ex-champ Bernard Hopkins as his trainer.

He'll have his work cut out for him.