Ridley Township Police say Kerri Anne Cline, 15, has been missing since the morning of December 22nd.
Cline was dropped off at Ridley High School by her grandfather and legal guardian that morning.
Cline's friends told her grandfather that she cut school in the second period that day and no one has seen or heard from her since.
Her grandfather said Cline had only moved in with him in August and has run away on at least two other occasions. In those incidents, Cline was found in Aldan and Tinicum.
Kerri is described as 5'04"tall, 130 lbs., blond hair, blue eyes and was last seen wearing white pants and a plaid hooded jacket.
Anyone with information is asked to call Ridley Township Police at 610-532-4007.