Selena Gomez & Ashley Greene: Memorial Day Party!

Selena Gomez wears Sauce‘s “Nasty” dress as she attends producer Joel Silver‘s Memorial Day party on Monday (May 28) in Malibu, Calif.

Twilight‘s Ashley Greene was seen rubbing shoulders with Josh Hartnett and Olivia Wilde outside on the deck. Gwen Stefani and Gavin Rossdale‘s sons Kingston and Zuma played on the giant inflatable toys with Tobey Maguire‘s daughter Ruby.

PHOTOS: Check out the latest pics of Selena Gomez

Robert Downey Jr. hid from the sun by wearing a white hoodie. Barbra Streisand and her husband, actor James Brolin, were also spotted at the party.

FYI: Joel has produced some of the greats in film including The Matrix and Die Hard. He and RDJ worked together on 2003′s Gothika, 2005′s Kiss Kiss Bang Bang, and 2009′s Sherlock Holmes. Check out Joel‘s full IMDB profile!

20+ pictures inside of Joel Silver‘s Memorial Day party…