Melton police are appealing for information after 13-year-old Sienna was reported missing.
The Brookfield teenager was last seen by family when she was dropped off at a shopping centre in High Street, Melton about 6.30pm on Thursday night to meet friends.
She had arranged to meet family at 9:00pm but did not attend the designated meeting point.
Police and family have concerns for her welfare due to her age and her disappearance is out of character.
Sienna is described as approximately 165cm tall and was last seen wearing a blue and white dress and white Nike runners.
She was carrying a brown purse and a black ‘Tommy Hilfiger’ jumper.
Anyone who has information about Sienna’s whereabouts is urged to contact Melton Police on 9747 7444 or submit a confidential crime report at www.crimestoppersvic.com.au