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The Tribeca Film Festival is in full swing and lower Manhattan is filled with stars celebrating the premieres of their latest independent films. Naomi Watts (in Alexander McQueen) and Matt Dillon posed on the red carpet together for Sunlight Jr., co-stars, Zac Efron, Heather Graham (in Stella McCartney), and Dennis Quaid screened At Any Price, and Matthew Bellamy came out to support fiancé Kate Hudson (Jenny Packham) for her new flick The Reluctant Fundamentalist. Click the photo to see more inside the festival’s hottest parties.

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As soon as the red carpet rolled up following the 85th Academy Awards at the Dolby Theatre, Hollywood’s brightest stars hit the party circuit for the all-night festivities! Adele (in Jenny Packham) was all smiles at the Governors Ball, the official after-party held just five floors up from the Oscars stage, posing with the golden statue she nabbed for Best Original Song for “Skyfall.” (“Watch the dress!,” she kindly told guests who kept stepping on her train.) Across town, two annual soirees continued their must-see appeal: Vanity Fair’s epic annual bash heated up with Jennifer Aniston, who posed with legendary designer Valentino Garavani, and Elton John’s 21st annual viewing party, which included guests like Heidi Klum (in Julien MacDonald), also raised money for the Elton John AIDS Foundation. “I love that Elton gets all these people out every year, and he makes a fun night into a very important night,” Klum told InStyle.com. “He’s raised more than $300 million dollars since 1992, and people show up!”

See more of the biggest parties of Oscars weekend in the gallery!

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• Oscars 2013: Behind-the-Scenes Instagrams!

— Reported by Sharon Clott, David Hutchings, and Carita Rizzo

The Academy Awards are not only a huge night for those nominated, but also for the designers who dress them! During New York Fashion Week, we asked designers to tell us which gowns from their fall 2013 collections they’d love to see on the Oscars’ red carpet, and all of them were quick to give us their top picks. “I’m sure any designer would love to have a great Oscars moment!” Christian Siriano told InStyle.com when we caught up with him backstage at his show. “There are so many actresses that I love and support.” Indeed! Click through to see the exact gowns Siriano, plus (from left to right) Zac Posen, Jenny Packham, Monique Lhuillier, Badgley Mischka, and more picked—and keep your eyes on our red carpet coverage, starting this Sunday at 6 pm, to see what Jessica Chastain, Jennifer Lawrence, Anne Hathaway, and all the other nominees choose to wear for their big night!