Paris Hilton was accompanied by sister Nicky Hilton to Britney Spears' Los Angeles concert Monday night, and a former "sister" was also there: Nicole Richie.

Paris and Nicole famously starred on The Simple Life together, but had a falling out in 2005. They reportedly made up in March 2010 after seeing each other at a Beverly Hills party, but Paris did not attend Nicole's 2010 wedding to Joel Madden. She did reportedly send a gift.

No word on if they ran into each other, but Nicole Tweeted a pre-concert vid of herself paying homage to Britney's dance moves.

Paris, who X17 can exclusively report has not split from boyfriend Cy Waits (contrary to online reports), sent several Tweets from the concert; see what she said after the jump!

Cameron Diaz and Justin Timberlake looked quite cozy for two ex-es at the premiere of their new flick, Bad Teacher, in New York Monday night.

We do love how highly they speak of each other; they're on such good terms! Cameron is currently dating Yankee Alex Rodriguez, while Timberlake split earlier this year from longtime girlfriend Jessica Biel.

In the flick, Diaz stars as a teacher with a bad attitude who wants to date Timberlake's goody-two-shoes character. Jason Segel co-stars; he also attended the premiere along with several other celebs. Check out all the pics below!

So far, Bad Teacher has received a 50 percent approval rating on RottenTomatoes.com, meaning critics are mixed on the pic.

Jennifer Lopez is getting back to her dancing roots in the video preview for her next single "Good Hit."

J-Lo, wearing a sexy Dolce & Gabbana bodysuit and matching leopard stockings, is armed with a blowdryer ... and wow, she's sporting some mighty big hair! The looks kind of reminds us of Cheryl Cole's massive 'do at the X Factor auditions.

We'll admit .. beauty school has never looked this enticing!

Mariah Carey is shopping photos of her newborn twins, Moroccan Scott and Monroe, but she won't get the millions she's looking for, reports The New York Post.

Reportedly, even though several magazines are interested in buying the first pics of the seven-week-old twins, the photos will only fetch about $200,000.

The most expensive baby pics sold to a magazine were the first pictures of Brad Pitt and Angelina Jolie's twins, Knox Leon and Vivienne Marcheline, in 2008. The pics went for a reported $14 million, though the money went to charity.

Carey and Cannon's twins were born in Los Angeles on April 30 but have not yet been seen in public. Said a rep for Carey: "She is still deciding when and if she's going to [do the pictures]. She is enjoying being a mom, and there's no rush. It's not about the money."

So, what is it about? Read why sources say Mariah and Nick want to sell the pics after the jump.

After Tweeting a controversial statement following Jackass star Ryan Dunn's death, film critic Roger Ebert is saying his words were "not intended as cruel."

On his website, Ebert wrote:

"To begin with, I offer my sympathy to Ryan Dunn's family and friends, and to those of Zachary Hartwell, who also died in the crash. I mean that sincerely. It is tragic to lose a loved one. I also regret that my tweet about the event was considered cruel. It was not intended as cruel. It was intended as true."

Dunn's Jackass costar had blasted Ebert for his initial Tweet ... telling the critic to keep his "f**king mouth" shut. Ebert continued with the following:

"I have no way of knowing if Ryan Dunn was drunk at the time of his death. I don't know what happened in this case, and I was probably too quick to tweet. That was unseemly."

It's just been determined that the passenger in Dunn's car, who was also killed, was a PA on the second Jackass movie. Read more of Ebert's explanation ... after the jump.

Amy Winehouse has canceled her entire European tour after reportedly falling off the wagon. The 27-year-old singer was booed by the crowd during a recent show in Belgrade after appearing on stage under the influence.

After arriving on stage over an hour late, the singer shouted to the 20,000 fans in attendance, "Hello, Athens."

Winehouse's rep released the following statement:

"Despite feeling sure that she wanted to fulfill these commitments, she has agreed with management that she cannot perform to the best of her ability and will return home. She would like to apologize to fans expecting to see her at the shows but feels that this is the right thing to do."

Following her brief performance in Belgrade, the Serbian defense minister Dragan Sutanovac called her appearance "a shame."

Find out where Winehouse is still scheduled to perform ... after the jump.

LeAnn Rimes has Tweeted another photo of herself in a bikini, further stirring up questions about her health.

The 28-year-old singer's thin frame has the blogosphere buzzing about whether she's struggling with an eating disorder. But what the Internet calls thin, LeAnn says is "lean." She's Tweeted in recent days:

"...this is my body and I can promise you I'm a healthy girl. I'm just lean. Thx for your concern but no need to be."

"I get upset at the judgement of "people" about body image. It's not black and white"

"I just eat a balanced diet and watch how much 'c***' I put in my body."

X17's fitness expert, Nicole Stuart, weighs in on the controvery over LeAnn's bod -- click here to check it out and let us know your thoughts; does LeAnn look good, or look like she needs a good meal?

Arnold Schwarzenegger, and his big belt buckle, greeted fans outside his hotel in Wien, Austria ... which happens to be his homeland.

The 63-year-old Total Recall star flew to Austria to give a speech at the Vienna Energy Forum. As predicted, Arnold stayed mum regarding his relationship with housekeeper Mildred Baena and his illegitimate son.

Meanwhile back here in Los Angeles, Arnold's estranged wife Maria Shriver is still considering divorce.

Keep smilin', Arnold.