The pop maverick had supported the band the previous night.
The xx brought Robyn out on stage last night to perform her dance-pop classic ‘With Every Heartbeat’. Oliver Sims and Romy Madley Croft joined the Swedish singer on backing vocals too.
The band are halfway through a string of gigs at the O2 Academy in Brixton, with three more shows left. Robyn had been the support act the night before, while Francis & The Lights and Floating Points opened up the night last night.
Watch a handful of fan-shot videos of the surprise performance via DIY.
