Kristín Anna Valtýsdóttir (aka Kría Brekkan) is an Icelandic vocalist and classically trained multi-instrumentalist. She is best known as a former frontperson of múm, and later on for collaborating with former husband David Portner as Avey Tare & Kría Brekkan.In late 2006, Kristín acknowledged that she had left múm in the beginning of that year, and published an open letter briefly describing her thoughts on the matter.

Kristín is currently a member of Stórsveit Nix Noltes, and has recorded and played live with Slowblow. She appeared on records by Mice Parade and on Animal Collective's Feels (on which she is credited as "Doctess").

Kristín recorded and mixed the Black Habit LP by Rings (featuring ex-members of First Nation). She appeared on the cover of Belle & Sebastian's 2000 Fold Your Hands Child, You Walk Like a Peasant LP with her twin sister, Gyða. In 2006 she did a Take-Away Show video session shot by Vincent Moon. She has been chosen by Animal Collective to perform at the All Tomorrow's Parties festival that they will curate in May 2011.