Alessandra Ambrosio, Leonardo DiCaprio, Larry David and other A-listers don costumes for the Casamigos Tequila Dia de Los Muertos Halloween Bash with Cindy Crawford and Rande Gerber; Krysten Ritter, Camilla Belle and AnnaLynne McCord admire the major bling at the Van Cleef & Arpels exhibit opening reception; Jane Lynch and Darren Criss attend the 12th Annual Celebration of Dreams Gala—catch up on the weekend's top events in this installment of Last Night's Parties.
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