British trio Alt-J have added a second Auckland show to their New Zealand tour after the first sold out.

The alt-rockers will now play two shows at the Auckland Town Hall, on December 12 and 13.

Tickets for the new show, on December 13, are on sale now.

They also perform at TSB Bank Arena in Wellington on December 14.

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They'll be playing on the back of their new album RELAXER, which was released to mixed reviews last week.