By Charlotte Tutton Celebrity Big Brother fans have been left in the dark as to when house guest Sharon Osbourne will leave the series, just a week before the live final. It was confirmed days before the series began that Sharon would be a house guest as opposed to a housemate, and she would not stay for the whole series. Amid reports Sharon would remain in the house for a matter of days, the star entered on launch night and has yet to leave. As the live final approaches, with it set to air next week on March 22, fans have been left confused as Sharon is still on the show with just over a week…