Nikki Reed, Derek Hough, Amber Valletta, and others attend a poolside bash celebrating recycled denim; Taylor Schilling, Bella Thorne, Jeffrey Katzenberg, and a slew of others step out for The Hollywood Reporter's 'Next Gen' 20th Anniversary Gala; Sharon Stone, Liberty Ross, Poppy Delevingne, and more honor women in the arts with LACMA—see how Hollywood celebrated Hump Day at events all over town in this edition of Last Night's Parties.