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.

[Busy Philipps via]

Shawn Pyfrom David Yurman Johnny Knoxville ELIZABETH BERKLEY Lady Victoria Hervey Kim Kardashian Cameron Silver Stephanie Pratt Selma Blair Anna Paquin sherri shepherd Kelly Osbourne Lisa Kudrow Ellen Pompeo Beverly Wilshire Hotel Francesca Eastwood Amanda Righetti Beverly Wilshire Julie Bowen Paul Smith Soleil Moon Frye Piers Morgan Jackie Collins George Kotsiopoulos kate nash Joe Slaughter Julia Sorkin Angelique Soave Barker Hangar Monique Lhuillier Jenni Kayne Sybil Yurman Kimberly Brooks P.S ARTS Busy Philipps Jason Kennedy Constance Zimmer Caitlin Crosby Kelly Patricof Amanda Luttrell Garrigus Holland Roden Consuelo Vanderbilt Costin Generosity Water Elizabeth Stewart Christa B. Allen Johnathon Schaech Bear Grylls Michael Johns Jerry Springer Madeline Carroll Jeffrey Alan Marks Ross Cassidy Carolyn Hennesy Maxwell Caulfield Alexandra Von Furstenberg Quddus. Beauty Undercover Presents Beauty Bazaar To Benefit P.S. ARTS Dawn Olivieri Zach McGowan Renee Bargh Children's Hospital Los Angeles Tom Payne Nathalia Ramos Jamie Bamber Bill Bellamy Shiri Appleby Katherine Jenkins Jack Wagner Huggies Hawaiian And Baby2Baby Luau Event Huggies Hawaiian And Baby2Baby Luau Kelly Sawyer Patricof Norah Weinstein Ayana Green-Oliver Kristen Bellamy BritWeek 2012 Gala Hosted By Piers Morgan Benefiting Children's Hospital Los Angeles BritWeek 2012 BritWeek 2012 Gala Hosted By Piers Morgan Nina Smith Sharon Harroun Bob Peirce Ross King Kerry Norton Jim Piddock Ann Cusack P.S. Arts And David Yurman Evening Of Modernism Robin Tunney Pam Bergman Emily McGowan Julia Pace Mitchell Marisol Nicols Quinn Ezralow Kevin Nealon Hilary Thomas Jean Pier Cont Oliver Furth Sean Yashar Generosity Water's 4th Annual Night Of Generosity Frank Stallone Matye Garcia