Patricia Arquette

Possibly pregnant Rachel Zoe keeps everyone guessing in a loose dress at Saturday's MOCA event with Gwen Stefani, Rachel Bilson, Kate Bosworth, and more. Check it out on PopSugar Rush!

Stars from the fashion world, Hollywood, and the art scene came together in LA on Saturday night at the MOCA's Artist's Museum Happening. The evening was sponsored by Chanel Fine Jewelry, and the design house dressed starlets including Mila Kunis, as well as BFF and Baby costars Rachel Bilson and Kate Bosworth, and Kirsten Dunst for the event. Gwen Stefani also wore Chanel as she walked the carpet hand-in-hand with Gavin Rossdale. Rachel Zoe arrived fashionably late with her own husband, Rodger Berman, and sparked a new round of pregnancy rumors in a dress that appeared to show off a small baby bump. Her former co-worker, Brad Goreski, chatted on the way in, saying that since he and the superstylist have gone their separate ways, he's taking advantage of being his own boss by hitting the gym any time he wants. Stay tuned to today's PopSugar Rush for even more interviews and highlights from the soiree!

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Find out what Halloween costumes Nikki Reed, Chaske Spencer, and more stars will be wearing this weekend! Check it out on PopSugar Rush!

Matt Damon takes a night off from caring for newborn baby Stella to rally celebrities at a ONEXONE fundraiser in New York. Check it out on PopSugar Rush!

Matt Damon made his first public appearance since the birth of his daughter Stella last week at yesterday's fundraiser for the ONEXONE foundation. It's an organization close to Matt's heart, and he's faithfully supported its efforts to help kids around the world for the past few years. Patricia Arquette was honored at the event for her philanthropic work, and her brother David broke from spilling about his separation from Courteney Cox to be there for her. Matt had a second to chat about his new baby, saying, "Well, she's very small! She's beautiful. She's perfect, what can I say? She's perfect." David, meanwhile, had to hurry inside the event, but Patricia took her time to speak to the press. She was hesitant to comment on David's relationship status, but she assured reporters that everyone involved in the situation is happy and calm about how things are turning out.

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Nicole Richie and Kate Bosworth hosted a bash in LA last night celebrating their pal Derek Blasberg's new book, Classy: Exceptional Advice for the Extremely Modern Lady. Derek's currently in the midst of a cross-country book tour that included a stop San Francisco, where he shared five fashion no-nos with Fab. Nicole was with Joel and their daughter, Harlow, earlier in the day, but her date for the evening was her soon-to-be brother-in-law Benji. Nicky Hilton, though, was the one subjected to Nicole's sense of humor while they posed for a photo. The evening was all about starlets, fashion, and Derek, but the party also interestingly brought out the apparently reconciled couple Balthazar and Rosetta Getty.

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Anna Kendrick joined the crowd at last night's Art of Elysium party at Palihouse Holloway in LA. She kept warm in her white coat for the second night in a row as she takes in all the pre-Oscar mania. This time she was joined by a super pink Amy Smart and silky Nicky Hilton, as well as a more casually dressed Topher Grace. Anna, who is building "freak out" time into her weekend itinerary, was representing this year's Academy Award nominees as the rest were scattered throughout the city at all the different soirees. In a few short days we'll see if the red carpet newcomer joins the ranks of iconic Oscar gowns or even takes home a win against all the predictions. Who do you think will become the proud owners of little gold men? Enter our Oscar ballot contest now!

To see more photos from the Art of Elusium party, just read more