Madison Lee De La Garza is an American actress and filmmaker. De La Garza is known for playing Juanita Solis on Desperate Housewives. She is the younger half-sister of singer Demi Lovato. Madison Lee De La Garza is an American actress and filmmaker. De La Garza is known for playing Juanita Solis on Desperate Housewives. She is the younger half-sister of singer Demi Lovato.