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We're told the break-up was a pretty mutual decision ... and both parties still "love and respect each other."

The two had been dating since 2007.

UPDATE: The couple's reps released a joint statement confirming the split -- and saying, "The two remain friends and continue to hold the highest level of love and respect for each other."

Law enforcement officials in Homer, AK tell us they got a call at 12:52 PM yesterday reporting a deceased male at the Best Western Bidarka Inn. Upon arrival they found 33-year-old Tennison lying on a bed unresponsive.

We're told a search of the room -- which was registered to Justin -- turned up a small amount of marijuana, as well as several bottles of alcohol in the refrigerator. Cops tell us they believe there had been a party in the room the night before.

It's unknown if the booze and drugs played a role in Justin's death -- his body was transported to the State Medical Examiner ... and an autopsy is scheduled for later today.

It all went down at Mad Bull's Tavern in Sherman Oaks, CA. Sources at the bar tell TMZ, Shia is a frequent patron of the establishment. According to witnesses, he got a little rowdy and ended up getting punched in the face.

Sources close to Shia paint a different story -- they say Shia was jumped on his way out of the bar. They say police arrived on scene shortly thereafter, cuffed everyone involved, and eventually let Shia go. Police have no record of any arrests being made.

Sources tell TMZ Jennifer will file divorce papers this week, possibly tomorrow.

Hall and Carpenter have been separated for "some time."

The split was first reported by "Access Hollywood."

Minaj is playing the role of host -- alongside Nik Richie of TheDirty.com -- at Mansion in Miami, FL on NYE. We're told the club shelled out $50,000 on an all-pink decor -- including cotton candy machines, carpets, drapery, aerialists, dancers and a specially designed midnight light show in Nicki's honor.

Oh, and all the waitresses will be wearing butt pads in an homage to Nicki's infamous derriere.

Sources tell TMZ ... Alex Welch was on the receiving end of Demi's blow. Welch is a backup dancer on the Jonas Brothers Live in Concert Tour. She was also a member of Beat Freaks, which got the runner-up title on season 3 of "America's Best Dance Crew."

We're told Welch -- who had a pretty nasty shiner from the incident -- has been talking to lawyers and is considering legal action.

Sources close to Demi say she feels "awful" about her behavior and took personal responsibility for it by leaving the tour and seeking help.

We're told Demi's issues with bullies go all the way back to middle school -- where she felt her acting career made her a target. Our sources say Demi subsequently engaged in self-destructive behavior that is a manifestation of being bullied.

In fact -- back in 2008, Demi told Ellen DeGeneres that she was bullied so badly in 7th grade, she pulled out of her middle school and switched to a home school program.

Emergency vehicles responded to the blaze and evacuated 4 people from the home. Arnie was removed from the house in a stretcher and placed into a waiting ambulance.

We're told everyone is "OK."

Warren tells us he was in the far left lane on a Miami freeway when he tried to change into the center lane ... at the same time that a cop decided to change into the same lane.

Warren says he saw the cop and tried to speed up to "safely make the lane change" -- and that's when the cop flipped on his lights and took Warren down.

TMZ obtained a copy of the letter -- which was read aloud today during the sentencing of Allison Coss and Scott Sippola -- Stamos asked the judge to make an example of the couple ... "This is an opportunity to send a public message that extortion and perjury will not be tolerated."

Stamos added, "They were caught turning the courtroom into a celebrity bashing circus. I was forced to watch the defendant slander me at trial with impunity."

John asked the court for $15,000 for attorney's fees, but the judge shot him down.

The trailer in question begins with Vince Vaughn telling a room full of people, "Ladies and gentlemen, electric cars ... are gay." Sources at Universal Pictures told Deadline Hollywood's Nikki Finke they showed the trailer to gay rights groups beforehand, including GLAAD, and didn't get any negative feedback.

But after Anderson complained on "The Ellen DeGeneres Show," we're told the studio folded like a cheap suit.

A rep for Universal Pictures tells TMZ, "The teaser trailer for 'The Dilemma' was not intended to cause anyone discomfort. In light of growing claims that the introduction to the trailer is insensitive, it is being replaced. A full trailer, which has been in the works for some time, will post online later today."

Now if only they can make the movie seem funny.

The Kardashian clan was at Juliet last night, when a male fan asked for a pic with Kim. His girlfriend flew off the handle and threw a drink at Kim.

Scott Disick and Khloe jumped into the fracas and in the scuffle, Khloe's ring flew off and skidded across the floor. Our spies inside the club say Khloe literally dove across the floor to retrieve it ... which she eventually did.

Our video shows the Kardashians leaving the club, covering their faces, as they beat a hasty retreat.

A rep for Pac -- real name Sean Waltman -- tells TMZ the arrest for possession of marijuana went down last Sunday at Newark International Airport ... and it wasn't the only bad thing that happened to him that weekend.

Waltman's rep says the wrestler got robbed the night before at a party -- so he showed up at the airport the next day without ID.

We're told the ID-less Waltman had to go through an "extensive search" -- which allegedly turned up one joint.

Sources tell TMZ the "Jersey Shore" money machine scored a $400,000 signing bonus to be the spokesman for a vodka company called Devotion.

But this ain't no ordinary booze -- Devotion contains a clear protein called Casein ... which can support an increase in lean body mass and a decrease in body fat if the user is also on some sort of weight training program.

We're told The Sitch's brother, Marc Sorrentino, brokered the deal through the company they run together, MPS Entertainment.

Jake and Vienna were talking about their breakup during the taping when Jake lost his temper -- and reportedly cocked his arm and made a fist in Vienna's direction.

A source close to Vienna claims Jake "has a really bad hidden temper. He snaps all the time, it was just the first time he did it in front of people."

Jake and Vienna had to be separated on the set and the interview was pretty much over before it began.

Jake's rep hasn't responded to calls yet. No word if there will be a second take on the interview.

UPDATE: A production insider tells us Vienna was interrupting Jake constantly during the taping ... "Chris Harrison had to tell her over and over again to let him talk."

The insider also says "Vienna was in such a rage, if there was anyone to fear it was her."

TMZ spoke with Vienna's stepmom Lisa -- who Jake tried to "win over" on "The Bachelor." Lisa claims that not only was Jake a total fraud ... but she insinuates that he was only motivated by ratings and not love.

Lisa claims, "I don’t think [Jake] ever really loved her ... I think he picked her because she is a dramatic person and it was good for the ratings.”