Kim Kardashian was assaulted Thursday night by a woman who threw white powder all over her, and it was concerning enough to call out the fire department.

Kim was at the London Hotel in West Hollywood for an event touting her new fragrance line, True Reflection. She was walking the red carpet when a woman threw the white powder at her from behind, covering her back and her hair. During the incident, the attacker shouted, "Fur hag."

Kim went to a private room, took the jacket off, brushed the powder off her hair and returned to the event. But the fire department had to examine the powder and deal with any possible danger.

They determined it was cooking flour.

The woman who threw the powder was detained by cops, but according to the Sheriff's Department Kim decided NOT to press charges and the woman was released.

Katy Perry threw on a Yankees hat ... and belted out a rendition of the Jay Z/Kanye West track, "N**gas in Paris" ... and it's ... interesting.

It all went down a few hours ago during a performance for BBC Radio 1 in London. Don't worry, Katy used the word "ninjas" instead of the OTHER n-word.

It ain't the first time Katy's covered a Jay Z rap song ... last year she covered "Big Pimpin'" during a performance in Auckland.

But back to the new song ... we gotta ask ...

File this under things you never thought you'd see: Rap superstar T.I. hanging out at an Atlanta nightclub ... with 68-year-old Robert De Niro ... and TMZ has the pics.

We're told the two did NOT arrive together ... De Niro originally hit the club -- called Vanquish -- with a friend right when the place opened. But a few hours later, T.I. rolled in ... and when he heard the Oscar winner was in the house, he HAD to meet him.

Sources say the two got along GREAT ... and spent the rest of the night talking and "chillin' together."

We're told Trey Songz and Fabolous were also at the club ... and both made sure to go over to De Niro to shake his hand.

Robert De Niro ... gangsta.

The Rolling Stones memorabilia museum in Germany isn't the only place in the world with giant mouth-shaped urinals -- Lamar Odom and Khloe Kardashian got one too ... and TMZ has a pic!!!

As we previously reported, several women in Germany are pissed over the lippy whiz receptacles in the German museum -- claiming they're demeaning to women -- but the museum owner is refusing to remove them ... because they're damn expensive.

But according to sources, Khloe and Lamar's urinal isn't so lucky -- and will be getting the heave-ho in the near future as part of a remodeling project in their Tarzana, CA home.

We're told it has nothing to do with how offensive the urinal may or may not be -- it just doesn't fit with the new decor ... so it's gotta go.

Sarah Jessica Parker was hard at work on the L.A. set of "Lovelace" on Wednesday ... taking over the role Demi Moore vacated after she was hospitalized last week.

Parker is rocking a long blonde wig to play '70s feminist icon Gloria Steinem in the biopic of late porn star Linda Lovelace.

As we previously reported, Demi dropped out of the project in the wake of her medical emergency ... when she inhaled dangerous amounts of nitrous oxide in the form of whip-its, lapsed into semi-consciousness and experienced seizure-like symptoms. 

The Demi Moore 911 tape will not be very revealing, because we've learned there's gonna be a lot of redacted information ... including the drugs she was using just before the emergency.

Law enforcement sources tell us ... The L.A. City Attorney is recommending that all references to drugs in the 911 conversation between the dispatcher and one of Demi's friends should be erased before being released to the public. The recommendation is based on patient privacy.

TMZ broke the story ... paramedics on scene were told Demi had been doing whip-its ... inhaling nitrous oxide immediately before she fell into semi-consciousness and had seizure-like symptoms.

Lenox Hill Hospital constructed a suite for VIPs which looks like a Four Seasons penthouse ... and the room was christened Saturday when Beyonce gave birth.

TMZ has obtained photos of the room where Blue Ivy came into this world, and it's baller. There are 4 flat screen TV's, state of the art electronics, a kitchenette, nice art, mahogany walls and plush furnishings. And take a look at the bed where Jay Z got some shut eye!

Sources connected with the hospital tell TMZ ... the suite was not constructed specifically for Beyonce, but it was always intended that Beyonce would be the first patient to use it.

Beyonce says she gave birth to Blue Ivy the same way women have been giving birth for thousands of years ... naturally -- insisting she did NOT get a C-section.

There were reports the singer birthed Blue with the help of a scalpel -- but Bey and Jay-Z released a joint statement moments ago, claiming, Blue "was delivered naturally at a healthy 7 lbs and it was the best experience of both of our lives."

The couple adds, "Her birth was emotional and extremely peaceful, we are in heaven. We are thankful to everyone for all your prayers, well wishes, love and support."

Looking like Marky Mark wannabes, 17-year-old Justin Bieber and his dad 37-year-old Jeremy showed off their smooth shirtless chests on the beach in L.A. on Wednesday.

There's nothing like quality topless family bonding. 

Marc Anthony wants Jennifer Lopez to know ... she ain't the only one with a hot, young plaything -- and he's got the photos to prove it.

Anthony just went to his Facebook page and posted a photo of himself gettin' all kissy kissy with a 24-year-old Venezuelan model named Shannon de Lima.

It's the first chick Marc has been romantically linked with since he split with J.Lo back in July.

Of course, 42-year-old Lopez rebounded with 24-year-old backup dancer Casper Smart.  

Chad Ochocinco's famous fiancee has slammed the brakes on the couple's wedding plans, TMZ has learned ... all because she suspects the NFL star has been messing around behind her back.

Sources tell us ... "Basketball Wives" star Evelyn Lozada recently confronted Ocho after she became suspicious about his behavior ... and she isn't convinced he's been faithful.

The two are set to be married in the summer -- and while Evelyn hasn't "officially" cancelled the wedding yet, we're thinkin' the priest should start making other plans.

Plus, Chad and Evelyn were supposed to begin shooting their new reality show in just three weeks ... we're told that plan is also up in the air.  

Rumors that Katy Perry and Russell Brand are calling off their marriage have just been fueled by explosive new photos ... of Russell in London ... NOT wearing his wedding ring.

The "Get Him to the Greek" star was in the West End earlier today, half a world away from his wife, who has been vacationing in Hawaii ... wearing nothing but bikinis.

The couple spent XMAS 7,000 AAdvantage miles apart. They tied the knot just over a year ago last October.