UPDATE: Police have found 28-year-old Grace Brittain at an address in Wattleup at 7.50pm on Wednesday night.
Grace is known to frequent the Mandurah, Falcon, Kwinana and Parmelia areas.
Police believe she may have recently visited the Beeliar area and they have concerns for her welfare.
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READ NOWShe is described as light skinned, approximately 166cm tall with blue eyes, dark blonde shoulder length hair and of a medium build.