Lollapalooza South America announced its full lineups and The xx will be headlining the three dates. These will be the first shows in nearly three years for the London dream pop trio. The band will headline the festival's stops in Brazil, Argentina, and Chile. Brazil will March 25-26, Argentina March 31-April 1, and Chile wraps it all up April 1-2. The band's last release was 2012's Coexist. Check out posters for Lollapalooza South America below.