O livia Rodrigo has won three Grammy Awards . At just 18 years old, the Gen Z pop-rock star was named Time ’s 2021 Entertainer of the Year after her first single “Driver’s License” launched her into the stratosphere . This April, with the release of her latest track “Drop Dead” , she became the first artist in history to have the lead singles from her first three albums, Sour , Guts and the forthcoming You Seem Pretty Sad for a Girl So in Love , debut in No 1 position on Billboard ’s Hot 100 chart. Still, when she walked out to perform at Spotify’s Billions Club show in Barcelona to celebrate securing over a billion streams on the platform, the internet zoomed its gaze in on one thing only: what she was wearing. In knee-high black Doc Martens and a floral babydoll dress, the 23-year-old cascaded through hits including “Deja Vu”, “Good 4 U”, “Jealousy” and “Bad Idea Right?” for 1,500 fans at the city’s open-air amphitheatre on the slope of Montjuïc mountain, Teatre Grec.…