Renee Blythewood, Salma Hayek, Ellie Gouldin, Jackie Sinclair, Jessie Ware, Sir Grayson, Amy Jackson, Perry, Alexandra Tango, Emilie Livingston, Jeff Goldblum, Alexa Chung, Maya Jama, Richard E. Grant, Jessica Gunning, Oliver Cheshire, Pixie Lott, Rebel Wilson, Harris Reed seen at Serpentine Gallery for The Serpentine Summer Party 2026