Busted by FBI
According to federal court docs, Josh Holly was busted in Nashville last Thursday after FBI agents seized and searched his computer ... allegedly finding several unauthorized credit card account numbers.
Law enforcement sources claim Holly -- who reportedly bragged online about pilfering semi-nude pics of Miley from her email account -- admitted to hacking into Cyrus' MySpace ... but hasn't yet faced charges stemming from the incident.
Holly was released Monday. Miley's rep had no comment.