The Osbournes, the reality sitcom about former BLACK SABBATH frontman Ozzy Osbourne and his colorful family life, is officially the biggest hit series in MTV's 21-year history, according to CNN. Just under 6.3 million people watched last Tuesday's episode, up from 6 million the week before," the cable channel reports. "No MTV series even cultural touchstones like Beavis & Butt-Head and Real World has reached such heights. MTV has been trying to take advantage of the hit, playing series episodes 15 times a week. The Osbournes has pushed aside professional wrestling as cable television's biggest show, according to Nielsen Media Research."As per the original agreement, MTV has prepared three more original episodes before its season ends. However, according to the report, it may try to use footage to create up to three additional ones.