Sydney Sweeney takes brother Trent as date for Echo Valley premiere & after party

Sydney Sweeney brought along her rarely-seen younger brother as her date to the European premiere of Echo Valley and following afterparty at London's BFI Southbank. Sydney, 27, oozed Hollywood glamour at the premiere in a halterneck baby blue gown, with a flowing tulle train, before undergoing a wardrobe change for the celebratory bash afterwards.