Cameron Diaz left the Chateau Marmont on Saturday night with a girl friend in a beautiful new Bentley. The eco-friendly celeb wasn't driving, but she did look fab in the stylish ride. The actress could afford the car like she does lavish vacations with boyfriend Paul Sculfor thanks to her huge paycheck, but instead this story is about her big heart. This weekend Cameron helped an injured, lost dog, which she reunited with its owner and visited at the vet. Even while being a good Samaritan and hanging out at the vet, Cameron showed off her envy-inducing wardrobe, topped off with oldie but goodie killer crazy heels.

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• American Idol has added songwriter Kara DioGuardi as a fourth judge for the upcoming eighth season. — BuzzSugar
• Tropic Thunder won the top spot at the box office for a second weekend in a row with $16.1 million. The House Bunny opened at the number two spot, earning $15.1 million. — BuzzSugar
• Barenaked Ladies singer Ed Robertson and three other passengers survived a plane crash in Ontario on Sunday. — The Intelligencer
• Four members of Helena Bonham Carter's family died in a minibus crash during a South African safari earlier this week, and she has stopped filming Terminator Salvation to fly back to the UK. — Sunday Express
• The Dancing With the Stars contestants for the seventh season were released today, and Kim Kardashian announced she will still be participating, despite recently injuring her foot. — Good Morning America
• Amanda Bynes was involved in a minor car accident on Sunday in LA; she was found to be at fault but nobody was injured. — People

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Mary-Kate snuck in some kisses while out to lunch at Barbuto with her boyfriend Nate Lowman in NYC on Friday. We've been hearing rumors that she's had this new artist man for a while now and seen her with Nate before, but this definitely seals the deal, and it's so cute. Plus, they've got matching plaid shirts. These photos might not be quite as amazing as last week's 55-photo Ryan/Rachel love fest, but I do love seeing the Olsen girls so happy.

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Britney Spears spent her Sunday grabbing lunch at Chaya after hitting the dance studio in LA. Unfortunately, we won't get to see her moves showcased on stage just yet — despite recent rumors, it has been confirmed by Ryan Seacrest that Britney will not be performing at the VMAs in two weeks. Most of us had our fingers crossed to see her on stage again, but maybe this just means the pop star is taking all the time she needs to get it right when she finally decides to step back into the spotlight.

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David Beckham made the trek to Beijing to participate in last night's closing ceremony, where the honor of the Summer Olympics was handed off to London for the 2012 games. His appearance was brief — he basically just kicked the ball while Leona Lewis sang with Jimmy Page — but he also found time to play spectator a bit while he was in town. While the Beijing games were likely the most watched Olympics in history, there are some people who are probably relieved they're over. I loved all of it, especially all the swimming, this weekend's Redeem Team win, all the gymnastics, and more — what was your favorite moment of the 2008 Olympics?

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After a stressful week including having her house in London vandalized, Sienna Miller headed to Ibiza for some serious rest and relaxation with her family and friends. This time she somehow managed to find herself a bikini top to wear (shocking), and wasn't joined by her man Balthazar Getty. She sipped on some wine and puffed away on her cigarettes — for all the horrible things that have been printed and said about Sienna this Summer, she seems to have managed to keep happy with her controversial new boyfriend and vacations galore. What do you think, are the tides turning back in Sienna's favor, or is her reputation tarnished forever?

To see 20 more photos of Sienna in her bikini, just read more