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This has gotta hurt ... R. Kelly's Illinois mansion was auctioned off Monday for $950,000 -- waaaay less than the $3.5-million-mortgage the singer took out to the build the place.

Kelly built the 20,000-square-foot dream home back in 1997 -- but things took a turn for the worse in 2011 ... when his bank tried to foreclose, claiming he hadn't made mortgage payments for over a year.

Kelly tried selling the crib for $1.6 million to block the foreclosure -- but no cigar ... it sat for a year. The bank then went full bore on foreclosure ... and it sold Monday for $950k.

The house has 6 bedrooms, 8 baths, an indoor pool, theater room and private lake.

Charlie Sheen's war against an L.A. private school has turned personal ... Charlie says his ex-wife Denise Richards has now been targeted by the school's "spineless" supporters, who have embarked on a campaign to bully her and their children.

Charlie posted the latest tirade on his Twitter account, writing, "Here's why people suck; a group of mindless Viewpoint [School] supporting doosh-bagz have targeted [Denise] and the girls with 'bullying tactics' as a response to my call to arms."

Sources close to Charlie tell us, Charlie believes the "doosh bagz" in question are connected with families at L.A.'s expensive Viewpoint School, which Charlie publicly accused of condoning bullying ... after his 9-year-old daughter Sam was allegedly teased into leaving the school. The school insisted it took appropriate action.

We're told the "doosh bagz" live near Denise ... and have been harassing her at home. So far, it's unclear what they're accused of doing.

As for his new rant -- Charlie continued, writing, "Leave them alone. This is not a threat but a promise that justice will be served. I'm not hiding. You are. Show yourselves you spineless cowards. Oh that's right; cockroaches scatter in the light."

Lindsay Lohan's court hearing is less than three hours away and she still has not arrived in Los Angeles ... TMZ has learned.

As TMZ first reported, LiLo hopped off her scheduled flight from New York to Los Angeles just before take off last night because she felt the plane was unsafe.

Lindsay eventually found a flight, tweeting at around 4:00 AM PT and thanking Mr. Pink -- an energy drink company -- for lending her a private jet.

According to our sources, the flight won't land in Los Angeles until around 6:30-7:00 AM PT ... meaning Lindsay has roughly 1.5 hours to make it to court, which starts at 8:30 AM PT. It might be enough time, but you have to factor in that Lindsay needs to make herself "camera ready."

And then there's this ... we know Lindsay's plane is set to land at the airport in Van Nuys. That means she has to travel around 20 miles to get to the hearing today at the Airport Courthouse. And it's gonna be rush hour!

According to our sources, Lindsay is not alone on the flight. She's traveling with her ex-assistant Gavin. He was the one who rolled on Lindsay and told the cops she was driving the car (despite her claims otherwise). The incident played a major role in their decision to charge her with lying to police.

Lindsay could have avoided all of this if she stayed on her original flight to LA. Even though it took off an hour late and was diverted to Las Vegas ... it still arrived in Los Angeles last night at 11:30 PM.

With breakup rumors continuing to swirl ... ('cause with George Clooney they always are) ... Stacy Keibler landed in Germany today, presumably to spend some quality time with her man.

Sources close to the couple tell TMZ ... the rumors of the couple's demise are way off-base -- in fact, we're told the two still live together and are currently redecorating the kitchen in their home.

Justin Bieber's hamster PAC -- the one he gave away to a random screaming fan less than three months ago -- is now spinning in that great hamster wheel in the sky ... in other words, he's dead.

TMZ broke the story ... Bieber unloaded the pet on an unsuspecting teenage girl in Atlanta last December ... cage and everything ... following his Jingle Ball concert. He told her, "That's all you ... you gotta take care of PAC."

The girl -- 18-year-old Tori McClure -- promised to take good care of the rodent ... and she actually did ... until the poor bastard kicked the bucket this week.

Tori tells TMZ, the hamster started to lose its hair two weeks ago so she took it to the vet over the weekend, but it was too little, too late.

We did some rodent research ... hamster hair loss can be caused by a variety of ailments, including chronic renal failure or a low protein diet ... it's unclear exactly what was eating PAC.

Tori says she buried PAC by a tree in her backyard, telling TMZ, "It's very peaceful there."

Unlike a Bieber concert.

Ed Asner was rushed to a hospital near Gary, Indiana yesterday ... after the 83-year-old actor suffered a medical emergency during a performance of his 1-man show.

15 minutes into his play "FDR" -- crew members escorted Asner off the stage after noticing the actor struggling with his lines.

According to SunTimes.com, Asner was taken by ambulance to a nearby hospital for treatment.

Asner is a Hollywood legend -- having won Emmys for his role on "The Mary Tyler Moore Show" and the spin-off "Lou Grant."

He was also the president of the Screen Actors Guild.

8:45 AM PT -- TMZ spoke with Ed's son, Matt, who tells us ... "My dad is doing fine. He was rushed to the hospital yesterday for being disoriented on stage."

"He is resting now at an Indiana hospital and is doing well and very grumpy, which with him is always a good thing."

"He is being assessed right now and what I can say is that it was not a stroke. That much we do know."

"He was feeling under the weather for a few weeks so he may just need some rest but for now he is just fine."

Kim Kardashian likes her windows like she likes her men ... the darker the better ... but moments ago, her tinted windows got her in trouble with the cops ... TMZ has learned.

KK was pulled over in Calabasas earlier today while on her way to the Kardashian family compound.

But this story has a happy ending for Kim -- we're told the cops only gave her a warning ... NO TICKET.

Kanye West had similar luck in January, when cops pulled over Kanye for speeding and tinted windows ... but let him go with a warning.

Rick Springfield was arrested today on a bench warrant stemming from his DUI case.

A rep for the L.A. County Sheriff's Department tells TMZ, deputies went to Rick's L.A. home this morning to execute the warrant ... but by the time he was being booked, Rick's attorney had the warrant recalled. Rick was subsequently released.

Rick posted an update on his Facebook from the Lost Hills sheriff station, writing, "I didn't know that I was supposed appear in court a few weeks ago. It was to do with the old DUI charge and it's been cleared up and I am free to go."

The bench warrant was issued Wednesday after Springfield failed to show up to court in February, when a rep for the court says he was supposed to show proof he completed an alcohol education program. Rick was also supposed to pay $1,555 in fines.

Springfield was ordered to complete the alcohol program as part of a plea deal he struck with prosecutors to keep his ass out of jail.

It all stems from Springfield's DUI arrest back in May 2011 -- when cops pulled over the singer's 1963 Corvette Stingray in Malibu ... and smelled booze. Law enforcement sources told TMZ Rick threatened to kill the deputy and his family if he had the car towed.

5:50 AM PT -- We're told Justin has been released from the hospital. He feels crappy, but still plans on going ahead with tonight's show.

Justin Bieber was taken to a hospital in London moments ago ... after collapsing backstage during a concert ... TMZ has learned.

A source close to Justin tells us the singer felt woozy during the show at the O2 Arena ... and with 4 songs to go, he stumbled backstage where he collapsed.

We're told the singer was pulled into a private room where he was treated with oxygen from emergency personnel.

Sources say Bieber was advised to go to the hospital ... but declined ... insisting that he "had to finish the show for his fans."

That's when Bieber's rep, Scooter Braun, went on stage and told the crowd ... "Justin's got very light breath. The whole show he’s been complaining, He’s backstage with the EMTs and the doctor."

A short time later, JB returned to the stage ... completed the show ... and got a HUGE ovation.

Justin was transported to the hospital directly following the show ... and we're told he's still there receiving treatment.

We're told he's in good spirits and feels OK ... but doctors want to evaluate him.

Demi Moore has filed legal docs responding to Ashton Kutcher's divorce petition ... and get this -- she wants spousal support and she's worth WAAAAY more than him.

Sources connected with Demi tell TMZ ... "She's got money up the wazoo" and has untold millions more than Ashton. He's not asking her for spousal support, so it's surprising she's going for it.

What's more ... she wants Ashton to pay HER attorney's fees.

Although there are reports that settlement negotiations have broken down, we're told it's not true -- both sides are negotiating and they expect a quick resolution.

It's almost out of the question Ashton will have to pay Demi spousal support -- a judge certainly would never order it.

One thing they both agree on -- they both checked the box citing irreconcilable differences.

Kim Kardashian went to the doctor yesterday because she was having pains in her stomach, and the doc warned she needed to slow down.

We're told Kim was flying home from Paris when she started feeling "severe stomach pains" on the plane. It freaked her out and she started bawling in front of other passengers.

Sources say Kim is "stressed out" ... we're told because she's prepping for her deposition in her divorce case with Kris Humphries and she's moving to a new house.

When Kim landed she went to her doctor, who told her she had flu-like symptoms and it was not a miscarriage warning.

We're told the baby's fine. In related news, we're told Kris Kardashian has already signed her.

Lamar Odom is in a New York courthouse right now ... battling it out with baby mama Liza Morales over child support and visitation ... and it must be exhausting because Lamar fell asleep on a bench in the hallway.

Lamar told TMZ ... he was exhausted with jet lag, which is why he fell into a deep sleep before the hearing. Cops actually became concerned because the Clippers star wasn't moving, so they nudged him awake.

On Liza's way out of court, we asked her if she happened to see Lamar snoozing ... and she laughed, saying, "He's tired."

In addition to child support and visitation, they're reportedly bickering over whether their son and daughter can appear on their reality TV shows. Lamar is on "Keeping Up with the Kardashians." Liza was on a show called "Starter Wives."

And get this ... we asked Lamar about being in the same restaurant last night as Kris Humphries. As we reported, they didn't speak ... but Lamar told us he didn't see Kris and would have gone up to him and said, "What's up," if he knew.

Bros before ...

Ben Affleck didn't kick anyone yesterday and was merely trying to get the paparazzi to back off ... because they were scaring his daughter ... this according to sources close to the Oscar winner.

Ben was holding 4-year-old Seraphina yesterday when they encountered a large mass of paps. According to our sources, the photogs got too close for comfort and little Seraphina started crying because she was afraid.

According to our sources, Ben asked the paps (none of whom work for TMZ) twice to back off and when that didn't work ... he said "You need to be this far away" and swung his leg to demonstrate.

Our source says Ben never had any intention of kicking anyone and he was merely trying to protect his daughter from the paps ... who he feels have been getting more and more aggressive.

The lead singer of Los Lonely Boys -- the band responsible for the hit 2003 song "Heaven" -- is currently holed up in an L.A. hospital ... after taking a nasty fall off stage following a concert last night.

According to the band's rep, the Boys had just finished their set when singer Henry Garza tried to greet some fans, but misjudged his step and toppled off the stage ... falling right into the orchestra pit.

We're told Henry's bandmate and brother, Joey Garza, immediately jumped down to his aid ... and Henry was transported to a local hospital.

The band was forced to cancel three performances in Hawaii this weekend as a result of the fall.

According to the rep, Henry's expected to recover just fine -- it appears there was no long-term damage done. It's currently unclear when the band will go back on the road.

Her name is Heather ... and she made her first public appearance with Arnold during a romantic dinner date in Santa Monica over the weekend.

The next day, the two met up for a brunch ... and everybody knows there's no such thing as a platonic brunch.

Sources tell TMZ ... Heather is not your average physical therapist ... she's worked with a myriad of professional athletes including UFC badass Georges St-Pierre.

It's unclear if Heather is actually treating Arnold ... but one source close to the Governator tells us, "She is not in the normal group of people who treat him."

Plus, THEY BRUNCHED TOGETHER.

We smell romance ... and huevos rancheros.