Ashley Greene, Jennifer GarnerDimitrios Kambouris/WireImage

Ashley Greene (in Donna Karan) and Jennifer Garner (in Gucci and a Pomellato bracelet) spent a night celebrating the most calorietastic food product at the New York premiere of their new film, Butter, which is in theaters now. “I’m so excited for people to see it and have a good time,” Garner told InStyle.com at the after-party, hosted by the Cinema Society, with DKNY, Forevermark, and RentTheRunway.com at Double Seven. “I’m so excited for people to see it because I love it!” Click through the gallery to see more stars at this week’s hottest parties.

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