The Pony singer/songwriter will perform at the festival alongside other recent additions including Boy Pablo, King Gizzard and the Lizard Wizard, and GoldLink.
Super Bock Super Rock 2020 will also host sets from The Neighbourhood, Local Natives, A$AP Rocky, and Foals.
Last year's festival saw performances from Phoenix, Lana Del Rey, Metronomy, Janelle Monáe, Christine and the Queens, Jungle, Migos, Cat Power, and many more.
Super Bock Super Rock takes place at Portugal's Sesimbra's Meco Beach from 16-18 July. Visit superbocksuperrock.pt for more information.