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Demi Lovato's on a mission to help with Hurricane Harvey relief efforts, and while volunteering at the Houston Food Bank she ran into Kevin Hart and NBA superstar Chris Paul.

We're told Demi donated 50,000 bottles of water to the food bank after hearing about price-gouging in the area -- and she set up a fundraising initiative with the food bank after donating $50k of her own dough.

Chris and Kevin were helping unload trucks and serve food. We're told the trio randomly bumped into each other and snapped a quick pic.

9:07 PM P.T. -- Cops say Heron died of an apparent illicit substance overdose...First responders attempted to revive the actor with Narcan, but life saving measures were ineffective.

Blake Heron, the actor who played Marty Preston in the 1996 movie, "Shiloh," is dead ... TMZ has learned.

Law enforcement tells TMZ, Heron's girlfriend went to his L.A. area home Friday morning and found him dead. Paramedics worked on Heron for 40 minutes trying to revive him, to no avail. He was pronounced dead at the scene.

We're told Heron had been sick the last few days.

Blake had battled heroin and had just gotten out of rehab ... literally days ago.

We're told EMTs who responded did not find any illegal drugs. There were several prescriptions, but they were for the flu. Our sources also say there was no evidence he had consumed alcohol.

Along with starring in "Shiloh," Heron had supporting roles in films "We Were Soldiers" and "11:14." He was recently in a documentary called "A Thousand Junkies" which premiered at Tribeca Film Festival.

Heron was 35.

RIP

Aaron Carter's family is desperate to get him help because they fear he'll relapse, hurt himself or worse ... TMZ has learned.

Sources close to the Carter family tell us some of Aaron's relatives believe he's suffering a mental breakdown -- particularly because he's been saying things like, "I can't take it anymore" and "I'm losing it."

We're told the family's concern was behind at least one of the multiple phone calls made to St. Petersburg PD earlier this week. The last caller, on Wednesday night, told cops Aaron was threatening to take Xanax and Klonopin ... and has been talking about suicide for months.

Our sources say the family is also worried he's relapsing by inhaling the aerosol spray used to clean keyboards. The family says this is what sent him to rehab back in 2011.

Rick Ross has no business blurting "Maybach Music" on any of his tracks, because he stole it ... so says a rapper threatening to sue Da Boss.

Ishaq Muhammad -- aka Young Muhammad -- fired off a threatening letter to Rick's legal team claiming Rick's use of the phrase "Maybach Music" is a rip-off of Muhammad's "Caprice Music" ... which Muhammad says he trademarked in 2006 ... long before Rick started saying his slogan.

So it seems ... Y.M.'s gripe is that Caprice is a type of car, and Rick just slapped his car of choice on the slogan. As you know, Rick kicks off every track with a woman who purrs the words, "Maybach music."

Muhammad says he'll slap Rick with a lawsuit and demand a cut of his profits if he doesn't back off.

We've reached out to Rick Ross' camp, so far no word back.

Country singer Don Williams -- a 2010 inductee into the Country Music Hall of Fame -- has died after a short illness ... according to his rep.

The Texas native began his music career in the 1960s, but went solo in 1971. He was known for his smooth voice and imposing stature, which scored him the nickname "Gentle Giant."

Williams had 17 number one country hits ... including "You're My Best Friend" and "Tulsa Time." His biggest hit came in 1981 -- "I Believe in You" reached the top of the country charts and #24 on the Hot 100.

Williams briefly retired in 2006, but made a return to touring in 2010 ... the same year he was inducted into the HOF. He played his final show in 2016.

Don's survived by his wife of 57 years, and his 2 sons. He was 78.

RIP

Troy Gentry -- one half of the country music group Montgomery Gentry -- was killed in a helicopter crash in New Jersey on Friday. He was 50 years old.

The helicopter crashed in a field in Medford around 1 PM ET. Eddie Montgomery was not onboard.

Troy Gentry is survived by his wife and 2 kids.

Montgomery Gentry's biggest hit is "Something to Be Proud Of" -- which topped the country music charts in 2005. They also had hits with "If You Ever Stop Loving Me" and "My Town."

The group was on tour, and they were scheduled to perform a concert Friday night at Flying W Airport and Resort.

It's unclear what caused the crash. Investigators are on the scene. The news was reported on the duo's Twitter account.

Story developing ...

Bobby Brown can reminisce about teaching Michael Jackson to moonwalk, allegedly ... but that's about it.

We got the R&B legend outside the Dream Hotel in Hollywood Thursday night where our photog went looking for a freebie -- a dance lesson from the man who this week claimed he taught MJ the iconic move.

By the way, Bobby's story is highly disputed. Michael's own sister, La Toya Jackson, says it was Shalamar member Jeffrey Daniel, and there's video proof to support that.

In any event, Bobby ain't quite ready to live out that alleged part of his glory days. The other takeaway here -- do NOT ask him about "Dancing with the Stars."

Janet Jackson is finally back on tour, and fans -- including Tyler Perry -- are reaping the benefits of some serious post breakup hotness.

Janet resumed her State of the World tour Thursday night in Lafayette, Louisiana -- but you'd never guess she'd given birth earlier this year. JJ wore some tight tops and flaunted her bod way more than she did before postponing her tour last year.

Of course, a lot's changed since then. Besides having baby Eissa, she's divorcing Wissam Al Mana.

His loss is the fans' gain. Her longtime friend Tyler was in the audience ... dancing and singing along.

Welcome back, Miss Jackson! Yeah, 'cause we're nasty.

Barbara Walters, not just a legendary broadcaster but beloved in New York social circles, has been living her life within the confines of her New York apartment, showing significant signs of age and receiving almost no visitors ... TMZ has learned.

The 87-year-old icon has become increasingly forgetful and confused ... sources familiar with the situation tell TMZ.

She almost never leaves her apartment, we're told, because she has an intense fear of falling down and breaking a hip ... something that often results in a downward spiral for older people.

Barbara does not want to receive guests. We're told she has shut herself off to almost everyone at ABC, and she only sees a few people who have been close to her.

Barbara does have a trainer who sees her weekly.

As one source says, the effects of aging are clearly present.

A trade to the New Orleans Saints may have saved Jon Dorenbos' life -- because the longsnapper just learned he has a very serious heart condition that was discovered during a team physical.

Dorenbos -- who dominated as a magician on "America's Got Talent" -- was traded from the Philadelphia Eagles to the Saints back in August and had to undergo a medical exam as part of the deal.

Saints coach Sean Payton just told the media ... doctors discovered the 2-time Pro Bowl player had an aortic aneurysm that will require immediate heart surgery.

Payton says, "It's a pretty serious condition."

Dorenbos is 37 years old -- and the news could signal the end of his NFL career -- but who cares as long as he gets healthy.

#GetWellSoon

Someone is trying to drag down One Direction over its song, "Drag Me Down," claiming the group pilfered the tune.

Amir Shaheed-Edwards, who goes by the stage name Bravo, claims the group ripped off his song, "All My Life."

Bravo says he recorded the song in 2015 and released it on SoundCloud. 1D's song was also released in 2015.

Bravo has now sued, claiming the 2 songs are "essentially identical." He does not give examples of the similarities in the lawsuit.

He's suing Syco Entertainment, which produced 1D, for damages and he wants the company to stop selling the song.

Mariel Hemingway is pleading for the 72-year-old manager of her grandfather's Key West home to evacuate before Hurricane Irma hits ... just take the cats and get out of Dodge.

The Oscar-nominated actress and granddaughter of Ernest Hemingway tells TMZ ... she thinks it's noble Hemingway Home's manager, Jacqui Sands, plans to stay put to hold down the fort and take care of its kitties -- but it's just not worth it.

Mariel offers Jacqui another option -- pack up the cats and GTFO.

As we reported ... the 1850's home -- where Hemingway wrote "A Farewell to Arms" and "The Snows of Kilimanjaro" -- is almost certainly going to be an Irma casualty, and cops say they won't be able to help Sands if she stays.

Mariel admires the manager's courage ... but fears she might be taking one of Ernest's famous quotes a little too far.

LeBron James added another job to his resume -- RUNWAY MODEL.

The NBA superstar hit the catwalk for the Kith Fashion Show at the Classic Car Club during NY Fashion Week on Thursday ... and killed it.

Bron was showing off his Nike LeBron 15 kicks -- while working the runway like a champ.

Scottie Pippen also walked the same show -- rocking a tracksuit and a modernized version of his of his old Nike Air Pippens.

Carmelo Anthony and Russell Westbrook were reportedly in the crowd. Those guys LOVE fashion.

Kim Kardashian is going to pieces ... and we should all stand up and applaud.

Clearly bringing her "A" game to Fashion Week, Kim strutted out of her NYC hotel Thursday night baring her midriff, legs and a healthy amount of cleavage ... all courtesy of a little black dress that was shredded in all the right places.

The wet head look is pretty damn sexy too -- hope she doesn't catch cold though.

Best expectant mom style. Ever? She's in the running.

Tear it up, Kim!

When disaster strikes make love, not hate ... that's B.o.B.'s take on sex in shelters.

We got the ATL rapper at LAX Thursday and he weighed in on the viral video of 2 people banging in one of Houston's Hurricane Harvey shelters. They were under the covers, but everyone around knew the deal.

B.o.B. gave it a green light ... however, he did lay down some ground rules.

God forbid you ever end up in a natural disaster -- but if ya do ... now you'll know ...

Dog the Bounty Hunter's got ZERO sympathy for fugitives seeking shelter as Hurricane Irma heads to Florida. He says throw 'em in the pokey ... however, there's a huge BUT.

We got Dog with his wife, Beth, leaving Craig's Thursday night in WeHo and we asked him for his take on a Florida sheriff warning fugitives they'll be jailed if they seek shelter as Irma levels its way to FLA.

For those who don't know what the Polk County Sheriff's Office said ... "If you go to a shelter for Irma and you have a warrant, we'll gladly escort you to the safe and secure shelter called the Polk County Jail."