Busy Philipps, Ellen Pompeo and other famous mothers give mom-to-be Anna Paquin a taste of what new parent life is like at a Saturday Luau event; Kelly Osbourne, Katherine Jenkins and other transplants from across the pond honor Piers Morgan with a BritWeek celebration; Julie Bowen, Lisa Kudrow and more hit the P.S. Arts Los Angeles Modernism opening night gala; Kim Kardashian steps out in support of Generosity Water—see what else celebrities were up to this weekend when they weren't partying for Cinco de Mayo in this installment of Last Night's Parties. More»

[Kirsten Dunst, Elle Fanning via] Emily Blunt, Kate Beckinsale and Colin Firth have date night at the opening of Stephen Merchant's new comedy show on La Cienega; Elle Fanning hosts an intimate dinner at Chateau honoring the Rodarte sisters with Kirsten Dunst, Sophia Coppola and others as guests; The Butterfly Gala takes over the SLS for a night of fashion appreciation and cocktails to benefit Children's Hospital Los Angeles—while most were still pooped from the Golden Globes, see which notables made it out to play last night around town in this edition of Last Night's Parties. More»