Nicky Hilton

It's all over for Nicky Hilton and David Katzenberg. Due to conflicting, hectic schedules, the couple has split after four years of dating, insiders confirm to The New York Post.

"The main reason was that they have been busy with their work, and it has made it difficult to spend time together," a source tells the newspaper. "Nicky has been back and forth traveling overseas a lot with her business. She has recently been in Asia promoting her jewelry line, and David is starting a new production company."

Katzenberg created MTV's The Hard Times of RJ Berger, while Nicky actually does seem involved in the family business. She'll be leaning on one of those family members in the face of this break up.

"Paris and I are going to go to the South of France next week for some business and pleasure," Nicky told Us Weekly on Wednesday.

[Photo: WENN.com]

Paris Hilton pictures are a dime a dozen. Nicky Hilton pictures are a little less common. Both sisters together? Well, that's just begging for a fashion face-off.

Earlier, we pitted a blue-haired Katy Perry and Lindsay Lohan, whose options were limited due to the ankle bracelet she had to cover up, against each other.

Now Paris and Nicky duke it out in a clash of fashionable, rich heiress titans.

As you can see, their MTV Movie Awards styles are as different as their personalities and hair colors. Which sister do you think looked best? Tell us below ...

Who looked better at the MTV Movie Awards?

We hope Tila Tequila is taking a 30-second break from Tweeting and actually reading THG right now. Listen up, crazy girl:

Nicky Hilton did not kill Casey Johnson's dogs. They are alive and well, as sources tell TMZ Elvis and Zoe were "taken to a veterinarian in Los Angeles for full checkups and were then released to the [Johnson] family."

Tila Tequila, please calm down about those supposedly suffering dogs now. And put on some clothes.

A few days ago, Tila called the police when Nicky Hilton and Bijou Phillips came over to take the puppies away. Tequila has since Tweeted non-stop about how Casey's two friends were planning on putting the canines to sleep.

But there's now proof that the animals are alive. After the aforementioned checkup, Hilton Tweeted: "Hope this clears up all the rumors."

It does. We apologize to readers for wasting their time over this nonsense.

We know you'd prefer to read about Morgan Christie, Jon Gosselin's new girlfriend. Please go do so.

Things continue to spiral out of control for Tila Tequila.

In mourning over the death of fiancee Casey Johnson, Tila got into such a tiff with other friends of Casey that she called the police yesterday. Here's what went down:

Nicky Hilton and Bijou Phillips came by Tequila's house yesterday to pick up a few of Johnson's belongings, most notably her two dogs. Tila refused to hand anything over.

Once the LAPD showed up around 2 p.m. - due to a "verbal dispute," an officer on the scene said - Tila was forced to wheel out a rack of clothing and both little dogs, who had been locked in a bedroom.

Following the exchange, Tequila told the media: "They don't care about the dogs. They are putting them to sleep to bury with Casey."

Both Hilton and Phillips denied this was their plan. The former also held a memorial at her home in honor of Johnson last night. Tila wasn't on the guest list.

After this incident, and after bashing Courtenay Semel to the press, Tequila seems to be losing more than just her loved ones and her mind these days. She, unfortunately, has few friends remaining.

Katy Perry may have kissed a girl, and she may have liked it, but we're gonna assume she won't love the fact that she's been caught wearing the same outfit as Nicky Hilton.

Few individuals would embrace a comparison with anyone from the talentless Hilton family. But perhaps Perry should have thought of that before she went shopping!

Study the photos below and then weigh in on our poll:

Who wears this outfit better?

Paris Hilton spent Christmas in Aspen, Colorado with her sister, her sister's boyfriend and her fake new BFF, Brittany Flickinger.

The quartet hung out downtown, posed for pictures, shopped and grabbed lunch at a local diner. Just like any big, happy, fake family would.

Check out the fearsome foursome below, as Paris and Brittany try to look like they have more than six words to say to each other...

Based on the photo below, it looks like Paris Hilton and Nicky Hilton share more than a set of parents. They share a wardrobe, too.

Who looks better in this outfit?

Happy Halloween, Nicky Hilton and Paris Hilton.

At the Playboy costume party, this pair of spoiled sisters honored skanky waitresses and bellhops around the world by dressing in revealing, ridiculous outfits...

David Katzenberg, decked out like a boring skeleton, looks almost ashamed to be seen with them, doesn't he?

We're not even sure what the point of wearing costumes such as this is. Why not just go naked and say you're being Breann McGregor for Halloween?

Call it fantasy celebrity fashion.

"It's Disney, princess-inspired and fun," Nicky Hilton said of her spring Chick by Nicky Hilton collection that helped kick off Los Angeles fashion week.

Yes, Nicky Hilton has her own fashion line. All these celebrities are starting to come out with them. Who's next? Lauren Conrad? Oh, wait.

In attendance for Hilton's first runway show was the 24-year-old's boyfriend of nearly a year, David Katzenberg, who told People:

"I am very proud of her. She worked hard on it."

Great quote from David Katzenberg there.

When it came time for the designer to take her walk down the runway for the event's finale, David Katzenberg, a man of few words, gave Nick a kiss on the cheek and white roses, then said, "I was impressed."

Nicky's rich parents, Rick and Kathy Hilton, also were on hand to show their least annoying daughter support. "Nicky is so passionate about her fashion. It's exciting to see her show," Rick said before the show began.

Among others who were there? My Name is Earl star Jaime Pressly. Noticeably missing? Famed Hollywood harlot (and Nicky's older sister) Paris Hilton.

And we thought it was gross when Ashton Kutcher ogled the chest of his step-daughter, Rumer Willis.

But at least there's no blood relation between those two.

The same can't exactly be said about Nicky Hilton and Paris Hilton.

Seen here, the spoiled sisters are enjoying a night out... and one of them is enjoying the view. We guess we can't blame Nicky - Paris Hilton nude isn't terrible looking - but someone should should show her this Pamela Anderson photo.

If you wanna ogle huge boobs, the former Baywatch star is a much better option.

And if you wanna really turn up this night of girl-on-girl action, give Katie Rees a call.