Last night in Beverly Hills, Rihanna threw the inaugural Diamond Ball to benefit the Clara Lionel Foundation. For the occasion, she broke her recent streak of sheer shirts and showed up in an elegant Zac Posen gown, while guest Kim Kardashian showed up pantsless. Meanwhile, on Rodeo Drive, Emily Ratajkowski, Chloë Sevigny, and Kirsten Dunst attended Coach’s backstage party, while back in New York, Paul Andrew threw a cocktail party to celebrate his recent CFDA/Vogue Fund win. On Wednesday, Angelina Jolie joined Kris Jenner and Kourtney Kardashian at The Hollywood Reporter’s Women in Entertainment event, while Grace Coddington attended ACRIA’s holiday dinner honoring Bruce Weber. Click through the slideshow for these and more highlights from this week’s party circuit, including Amanda Seyfried, James Franco, Joan Smalls, and more.