Olivia Rodrigo 's forthcoming third album— You Look Pretty Sad for a Girl So in Love —is all about the babydoll dress trend . After wearing a mixture of floral dresses and vintage lingerie-inspired looks on Saturday Night Live , Rodrigo headed to Barcelona , where she paired her next babydoll with chunky Dr. Martens . On May 8, Rodrigo delivered a special performance at Spotify's Billions Club to celebrate her partnership with FC Barcelona. The " Drop Dead " singer is no stranger to wearing classic British brand Dr. Martens after showing love for the label's Mary Janes . In Barcelona, Rodrigo decided to pair her Generation78 Hand-Embellished Puff-Sleeve Top—worn as a dress—with a pair of 1B60 Bex Pisa Leather Knee-High Boots from Dr. Martens, which retail for $240. Olivia Rodrigo wearing a pair of 1B60 Bex Pisa Leather Knee-High Boots from Dr. Martens. (Image credit: Xavi Torrent/Getty Images for Spotify) Dr.…