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Mariah Carey was the headliner of her manager's daughter's Bat Mitzvah ... but someone's got to tell her the meaning of "mazel tov!"

Mariah made a grand entrance into 1 OAK in WeHo Friday for Mishka Bulochnikov, the 13-year-old daughter of Stella.

The event was insane ... a 500 lb chocolate and red velvet cake, mini Kanye from Jeff Beacher's Madhouse, a Bentley golf cart which Mishka got as a present, a DJ from Power 105 ... but the thing is ... it cost hundreds of thousands of dollars to rent the club out on a Friday night.

Kids ... they're expensive.

The doctor commissioned to save Prince's life treated one of the most strung out rock stars in history.

Former Guns N' Roses drummer Steven Adler sought treatment from Dr. Howard Kornfeld in the mid-'90s to kick a vicious heroin habit.

Adler's been open about his demons -- his heroin problem got him booted from Guns N' Roses. In 1996, right around the time he was being treated by Kornfeld, he suffered a stroke from an OD that left one side of his face paralyzed.

We're told Dr. Kornfeld treated Adler with the same synthetic opiate Kornfeld's son carried in his backpack to Prince's home.

Akon put his home on the market, but anyone looking to snatch it up better bring a checkbook AND a handyman.

The Sandy Springs, GA crib hit the market for $2.595 million, and the singer/producer figures to take a loss. It was purchased for just under $2.7 mil, and needs roof repairs ... which could equal a good discount for someone.

The home is on a massive lot in a gated community ... and check out the spread in this gallery. Two pools, 2 guest houses, and basketball and tennis courts.

The grandsons of Sean Connery and Tony Curtis are giving their family names a bad rap ... because cops say they snuck onto someone's property and egged on a tagger.

Law enforcement sources tell us the young adult grandsons were caught on tape last month jumping a wall with a teenager and watched the guy tag a wall and garage door. We're told LAPD hunted down the trio and the juvenile fessed up.

Law enforcement tells us ... cops are sending the case to the L.A. City Attorney for possible prosecution for criminal trespass.

There's some secret little differences hiding in these denim clad Dakota Johnson photos. Can you use your spy skills to find the differences between the two similar shots?

Alley Mills' good looks are a world wonder!

Here's a 38-year-old version of everyone's favorite TV mom from back in the "The Wonder Years" days (left) and 27 years later ... the blonde bob-shell -- who is celebrating her 65th birthday this month -- at a daytime Emmys party last weekend (right).

"The Bold and the Beautiful."

The question is ...

Blac Chyna has broken ranks in the burger department, making a Burger King run hours after TMZ broke the story ... she is pregnant with Rob Kardashian's kid.

Chyna was in downtown L.A. with a friend, scoring a few bags at the drive-thru.

Jermaine Jackson thinks the deed that was filed attempting to transfer the title of Michael Jackson's Hayvenhurst home to Katherine was kosher, because he says that's exactly what MJ wanted.

We got Jermaine Friday at Health Nut in Calabasas, and he made it clear ... his mother and siblings have big beef with the Michael Jackson Estate.

TMZ broke the story ... Katherine signed legal docs 2 weeks ago making it appear that Michael deeded the family home to Katherine and his 3 kids. Jermaine is acting like either he or his siblings might be behind it, but he never says.

Saint West is already getting a taste of the family biz -- chilling in Cuba for the Kardashian family vacation TV shoot ... and making his paparazzi debut!

It's the first time Kanye West and Kim Kardashian have taken the 5-month-old out in public ... and Kanye looks every bit the doting dad.

Big sis North already looks like a natural in front of the camera -- so we're guessing in another year or so Saint will be freestylin' verses.

Doris Roberts died from a massive stroke ... according to her death certificate.

TMZ obtained a copy of the doc, filed in L.A. County Court -- and it reveals the "Everybody Loves Raymond" star had been suffering from hypertension for years.

The immediate cause of death though ... was a "large hemorrhagic cerebrovascular accident" ... the medical term for a stroke.

Prince's blood will be under a microscope soon at the request of the special administrator of his estate.

A judge in Carver County authorized Bremer Trust to order DNA testing of the late singer's blood ... for purpose of addressing "parentage issues." It's clear Bremer is expecting alleged family members to come out of the woodwork to get a slice of Prince's fortune.

According to docs, there is a sample of Prince's blood being held at the Medical Examiner's office for testing.

A Laguna Beach hot spot is fighting back against 7 women who say they got tossed from the restaurant because they're Muslim -- but the owner says the Muslim community is on his side.

TMZ's obtained a copy of a letter Urth Caffe owner Shallom Berkman is sharing with customers to explain why he's filed a countersuit against the women ... saying they were the victims of discrimination when they got thrown out on April 22. Video of the incident went viral.

In the letter ... Berkman says his popular establishment has always been about welcoming people of all religions, races and sexual orientations. In fact, he says his wife, Jilla, is Muslim -- and so are a large percentage of his customers.

He says they've vowed to stand by him and his wife during their legal battle.

As for why the women -- most of whom were wearing hijabs -- were "asked to leave" --

a strict 45-minute limit for outdoor seating during peak business hours, and they refused to follow the rule.

Chris Brown's alleged stalker Danielle Patti will undergo a mental evaluation after her latest arrest at the singer's home.

Danielle Patti was in court Friday for a bail hearing when the judge gave the order. You can see in the video, Patti tried to speak directly to the judge -- declaring she wanted to dump her attorney and represent herself -- but the judge wasn't having it.

Danielle's been in jail since last week after she was arrested for trespassing at Chris' home for the second time since December.

Rob Kardashian and Blac Chyna are about to expand ... we've learned she's pregnant!

Sources close to both Chyna and Rob tell us Chyna's several months along -- and it's not one of those, "Oh crap, you're pregnant" situations. We're told they're both super excited.

The baby will be Rob's first and BC's second ... she's got 3-year-old King, whose dad, of course, is Tyga.

Congrats.

11:25 AM PST -- Rob and Chyna just confirmed the baby news on Instagram with a pregnant Chyna emoji. Tyga also sent his well wishes, writing "Congratulations" under Chyna's announcement ... Kylie "liked" the post too.

The man who brought a synthetic opiate to the place where Prince was found dead won't talk about the investigation that focuses in part on him.

Andrew Kornfeld was at his dad's rehab facility Thursday when a photog asked about his decision to take the pills across state lines. We're told Andrew, who does not have a medical license, is under the microscope ... to determine if he's violated a law prohibiting the unlicensed practice of medicine.