*UPDATE: As of 3.10pm today, Alexandra has been found alive and well.*
Police have appealed for assistance in locating a missing 13-year-old girl.
Alexandra (Lexie) Walters was last seen at her home in High Wycombe early this morning.
She is described as fair-skinned, approximately 155 centimetres tall, of medium build and with strawberry-blonde hair cut in a 'bob' style.
She also has blue eye, and could be wearing a black top and orange thongs.
According to WA Police, she is believed to be pushing a black and green bicycle with a flat tyre.
A police spokesperson has said that Lexie is autistic and has the emotional age of a six-year-old. She does not communicate well with people.
Police are concerned for her wellbeing and urge anyone with information to contact police on 131 444.