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The Situation is on the wrong end of a massive Federal criminal investigation -- which is currently focusing on the "Jersey Shore" star's cash flow ... TMZ has learned.

Sources tell us, Mike Sorrentino and his companies -- MPS Entertainment, Situation Productions, GTL Management, and his clothing line Situation Nation -- are at the center of the investigation.

The exact nature of the crime is unclear, but we know it's a felony, and appears to be finance related. We're told subpoenas have already been issued to Sitch's business associates, asking for copies of payments issued to him, copies of canceled checks, correspondence, and more.

We reached out to Situation's rep for comment. So far, no word back.

Fist pump has a whole different meaning in prison.

"Teen Mom" star Amber Portwood is no longer a prisoner to fashion... especially prison fashions ... and TMZ has learned she's embracing her freedom by creating a whole new glam look for herself.

After serving 17 months behind bars ... Portwood has freed herself from her harsh, mugshot makeup ... and is now showing off a post-prison makeover that gives her a softer, more sophisticated look.

Sources close to Amber tell us ... she's treated herself to a whole new set of clothes ... and a stylish new haircut.

But the biggest change ... they say ... she no longer uses homemade, prison-style hairspray (which is often made from Jolly Rancher candies because it's sticky and provides excellent hold).

So, the good news -- she looks great.
The bad news -- her hair no longer tastes like grape.

Stop us if this one sounds familiar -- one of the people from the ex-MTV show "Buckwild" was arrested this morning in West Virginia ... this time for a DUI.

Anna Davis -- who the show described as a "true wild child" -- was busted early Saturday morning for aggravated DUI.

It's unclear at this point why the DUI charges were elevated since a whole slew of things could have caused it ... but the same thing happened to her co-star Bluefoot earlier this year when he had a BAC higher than .15.

Anna was released hours later on a $1k pr bond -- meaning she didn't have to pay ... just promise to show up in court.

Hollywood celebrities are abandoning the Lakers in droves ... and they're defecting to the rival L.A. Clippers ... so says MTV star Chris "Drama" Pfaff.

Pfaff -- who stars on a slew of MTV shows including "Fantasy Factory" and "Ridiculousness" -- was out in NYC yesterday when he admitted he's hitching a ride on the Clippers bandwagon.

"Clippers games used to be empty," Drama said ... but that was before Blake Griffin, CP3 and company began dominating.

Now, according to Pfaff, Lob City games are packed with celebrities and floor seats are nearly impossible to lock up.

Miley Cyrus traded twerking for toking at the EMAs -- the European version of MTV's VMAs -- puffing a fat joint on live TV Sunday night.

Cyrus performed twice during the show without sparking any controversy -- but while accepting the award for Best Video she shocked everyone by lighting up.

The awards were in Amsterdam, so she probably won't get in trouble, and Miley took full advantage ... while wearing a onesie and fur coat.

Guess marijuana isn't the only thing they're lax about over there.

When the EMAs aired in the U.S. ... Miley's joint smoking was edited out.

Pauly D's baby mama Amanda Markert doesn't deserve ANY custody of their child -- so says the father of her first kid, who thinks Pauly couldn't possibly be a worse parent than Amanda already is.

Lance Gerbino is obviously biased, but he's still got a lot to say -- telling TMZ, Amanda has done nothing but spew huge, wretched lies ever since they met.

Get this ... Lance claims a month before he knocked up Amanda she told him she had cancer and couldn't get pregnant. Further, Lance says when she did get pregnant ... Amanda left him in the dark about whether he was the daddy.

Lance says Amanda's now doing to Pauly what she did to him -- lying and playing games -- and that's why he believes Pauly should get full custody of Amabella.

Amanda declined to comment ... but we spoke with a close relative of hers who told us Lance is full of BS and called him "a freaking, druggie liar."

Pauly D has his own reservations about Gerbino ... one reason Pauly wants full custody of Amabella is because there's a felony drug arrest warrant out for Gerbino, and he doesn't want his baby anywhere near the guy.

Amber Portwood may be hanging out at a Panera Bread with her ex ... but that doesn't mean they're bangin' again ... this according to Amber and her baby daddy.

Amber and Gary Shirley made it clear outside the tasty food chain in Indiana today ... telling a photog they have no plans to get back together following her exit from prison this week.

As you may recall -- Gary and Amber had an extremely volatile relationship ... Back in '10 Amber was arrested for attacking Gary while MTV cameras were filming for "Teen Mom."

It was a whole thing.

For now, it seems the two are simply trying to get along for the sake of their kid ... but in case that doesn't work out -- hopefully Gary's learned to duck.

Pauly D will meet his 5-month-old baby for the first time today ... TMZ has learned.

We've learned the MTV star and his baby mama Amanda Markert have hammered out a temporary truce in their ongoing custody battle -- and Amanda has agreed to let Pauly meet their daughter Amabella.

Sources close to Amanda tell TMZ ... the meeting will take place at a neutral location somewhere near Amanda's home in New Jersey sometime in the next few hours.

It's a huge step for the parents -- who've hated each other's guts ever since the baby was conceived during a drunken night in Vegas back in 2012. Amabella was born back in May.

Pauly is fighting Markert for full custody of the little girl ... accusing Amanda of being a horrible mom who's using the baby as leverage for fame and to get money from him.

Markert says Pauly's interest in his daughter is all for show and is not real.

A rep for Pauly D had no comment.

Good to see they've put their differences aside ... at least for now.

Ex "Teen Mom" star Amber Portwood is savoring every moment after 17 months behind bars -- reuniting with her 4-year-old daughter on Monday -- and TMZ has the photos.

As we reported, Amber was originally sentenced to 5 years in an Indiana prison for violating probation in her drug possession case, but she was released early for good behavior and time served.

Sources tell TMZ, as soon as Amber got out she made a detour to a burger joint called Frisch's Big Boy -- and then beelined to see Leah ... who's been living with her dad while Amber was locked up.

Amber's baby daddy, Gary Shirley, currently has full custody ... but we're told she's planning to seek shared custody ASAP.

"Teen Mom" star Amber Portwood was just released from an Indiana prison ... almost a year-and-a-half after she begged a judge to put her behind bars ... and now she's ready to eat.

Amber was initially sentenced to 5 years in the big house for violating probation in her drug possession case.

The judge had given Amber the choice of going to a drug rehab program instead of prison -- but Amber decided she would rather serve time than do the program.

Now, we've learned the 24-year-old MTV star -- who began her sentence in June 2012 -- was released Monday morning (only 17 months into her sentence).

We're told Portwood was granted early release due to good behavior, time served and the fact that she completed two unspecified prison courses while serving her time.

She walked out of the prison today wearing a grey sweatsuit ... and a smile ... and says the first thing she wants to do as a free woman is "go get something good to eat."

Pauly D has just been REJECTED by his baby mama ... who says she will NOT let him visit his 5-month old daughter unsupervised.

Pauly's lawyer sent a letter to Amanda Markert's attorney, requesting that Pauly get visitation of the little girl, Amabella, for 2 weeks beginning today.

TMZ has learned ... Markert's lawyer told Pauly's mouthpiece to pound sand, saying Pauly cannot take the baby unsupervised for that period of time. So it seems she might be open to visitation if she or someone else she chooses is present.

Our sources say Pauly D's lawyer has agreed to supervised visitation but now all they're getting is radio silence.

Pauly's rep tells us, "Paul and his entire family are eager to meet and spend time with Paul’s daughter. Paul has been requesting visitation for quite some time now, but his requests have either gone unresponded to or denied. He and his family are committed to being a significant part of his daughter’s life and are excited to make that a reality. "

Pauly D's got his work cut out for him with his new baby mama -- so claims the daddy of her 1st child ... who has some serious words of warning for the "Jersey Shore" star.

Meet 33-year-old Lance Gerbino, the father of Amanda Markert's 5-year-old son. His friend just posted this video on Instagram, where Lance calls Amanda a crazy "drug addict stripper" -- something she strenuously denies.

Lance is no angel himself -- as we reported, one reason Pauly wants full custody is because there's a felony drug arrest warrant out for him, and he thinks there's a danger if Lance comes in contact with the baby.

As for Amanda, her lawyer tells us, "Amanda is an extremely wholesome young lady who is goal oriented." He adds she's never been a stripper and has absolutely no drug issues.

BTW ... Lance's friend has taken the video off Instagram.

Pauly D says his baby mama is a shameless fame whore who's treating their daughter like a winning lottery ticket ... and he won't let her keep him from seeing his little girl.

Pauly was rollin' through the airport in North Carolina this morning when he was asked how he felt about becoming a dad.

"I want to give the baby the best life she ever had," Pauly said.

He also joked that D.T.F. no longer means, "Down to F**k," ... it's now, "diapers, tantrums and formula."

But that terrible joke aside, Pauly says he's ready to go to war with Amanda Markert because, "I want my baby."

"Jersey Shore" star Vinny Guadagnino says he doesn't wanna knock up any ex-Hooters waitresses like Pauly D ... so he makes sure to wear a jimmy hat -- on top of his condom.

Vinny was strolling through NYC when we asked about co-star Pauly D's baby mama drama ... and he was pretty open about the whole thing.

V.D. says he's not lookin' to knock up ANYONE ... so when he bangs around, he double bags his junk ... just in case. No love child for this Guido.

Fun Fact -- Wearing two condoms actually INCREASES the chance of pregnancy ... 'cause the friction can break the condom (duh, remember 4th grade sex ed?)

The chick Pauly D knocked up claims she's no longer looking for a custody war, and is now willing to accept co-parenting with him -- but TMZ has learned the "Jersey Shore" star has serious concerns about another guy in her life.

Amanda Markert called in to TMZ Live to talk about Pauly's fight to gain full custody of their 5-month old daughter, Amabella -- and said, "I would hope that no one would ever want to take an infant away from her mother, and I'm hoping that she can have 2 parents in her life that can get along together."

That's a huge shift -- as we first told you, Amanda and Pauly basically hate each other -- and she confirmed they've had no relationship whatsoever since their one-night stand in Las Vegas.

Sources close to Pauly tell us one of the reasons he wants full custody is because Amanda's first baby daddy (of her 5-year-old son) is currently a wanted man for felony drug charges.

According to a Florida police report ... he was busted for DUI after a car accident, and police say they found him at the scene with bloody needle marks in his arm, and methadone pills -- commonly used to treat heroin addicts.

He skipped a court hearing, and now there's a bench warrant out for his arrest -- but Amanda explained she's already taken steps to protect herself and her children from the guy.

Amanda may want peace, but ... watch the clip. This is ain't no rom com.