The band, who last week released their second album Coexist, play five dates before the end of the year.
Coexist topped the UK album chart at the weekend, knocking the latest release by The Script into second place.
The xx this month played live shows in London and Cardiff.
Tickets for the new dates go on sale this Friday, September 21 at 9am.
The full tour dates are as follows:
- December 6 - Brighton Dome
- December 11 - O2 Academy, Newcastle
- December 12 - Wolverhampton Civic Hall
- December 14 - Bristol Colston Hall
- December 16 - O2 Academy Brixton, London<
Watch The xx perform 'Angels' live in Tokyo below: