‘Extra’s’ Jenn Lahmers spoke to Olivia Cooke at the L.A. premiere of the ‘Game of Thrones’ prequel ‘House of the Dragon.’ Olivia dished on her character Alicent Hightower, who marries her friend Rhaenyra Targaryen’s father Viserys, leading to a rivalry as the women fight over the Iron Throne. Olivia also dished on sitting in the Iron Throne on set! ‘The House of the Dragon’ premieres August 21 on HBO and HBO Max.