Genevieve Knight Hannelius , known professionally as G. Hannelius (or G Hannelius), is an American teen actress and singer-songwriter. She currently stars as Avery Jennings in the Disney Channel sitcom Dog with a Blog. Prior to this, she had recurring roles in the Disney Channel series Sonny with a Chance and Good Luck Charlie. She has also starred in Leo Little's Big Show and has done voice work as Rosebud in the Air Buddies films. She also guest starred in Disney Channel's series Jessie.