Nicole Richie and Joel Madden took a break from house hunting to show their charitable sides at the Sephora Project Launch Party in LA last night. These two are no strangers to giving back, and they spent their night chatting with teenagers from Girls For a Change, which encourages girls to make a difference in their neighborhoods. As the happy couple continues to balance work, family, and doing good, it's no wonder they need to find an intern to help them with their own foundation.

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Naomi Watts looked like she didn't want Summer to end in her hot pink dress and white sunglasses out in NYC with her son today. Just like Naomi's baby bump, Alexander is getting so big — and in a few months we'll get to see him as an older brother. Exciting new job for the little guy, just as his mom is taking more on her plate as the face of Thierry Mugler's cosmetics line. Naomi's 40th birthday is coming up in a few weeks, just adding to everything the Watts-Schreiber family has to celebrate.

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Cameron Diaz and Paul Sculfor were back at each other's sides today, and there were plenty of kisses and hugs for all of Manhattan to see. After getting up close and personal at the US Open, we wonder what fun activity they have planned next. As one of our favorite hot couples of the Summer, we're glad to see they're ready to take their PDA right into Fall. In fact, they're already the subject of marriage rumors, which is pretty typical in Hollywood considering they've only been together a few months.

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Rachel Bilson knows how to work it for fancy photo shoots, but she was back to incognito casual in her fedora and sunglasses buying food at Gelson's in LA yesterday. She may look tiny pushing the full cart, but Rachel has proved more than once what a tough little cookie she is. On the other hand, she probably wouldn't mind a little shopping company from her boy who knows how to make her laugh.

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Katie Holmes looked ready to work, Starbucks in hand, on her way to rehearsals in Manhattan today. While she's spending her days working on All My Sons, Katie's been getting praise from her Eli Stone costar for the singing and dancing skills we'll get to see in her upcoming guest spot. Meanwhile, rumor has it Tom is secretly screen-testing Valkyrie across the country, even though it isn't set to release until Dec. 26. With all the trouble Tom's been having with the film, it's probably good to get a quiet head start, and maybe some of Katie's good luck will rub off on him.

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Rihanna looked calm and collected in another snappy outfit arriving at Radio City Music Hall for rehearsal before her big weekend participating in three major events. She's taking the stage Friday at Fashion Rocks in NYC, lending her voice to the Stand Up For Cancer song and performing at the VMAs in LA on Sunday. Luckily, Chris Brown will be right there with her for the hectic few days not that it ever looks like the stress gets to Rih. She's not the only one who will be getting the red carpet celebrity treatment — don't forget to enter to win a VMA gift bag just like the stars get, all you have to do is comment!

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