I cant believe this why are they doing it???????????????????

The upcoming fourth season of the Disney Channel's hit "Hannah Montana" will be its last, according to the Disney Channel.

Starring Miley Cyrus, the new season starts shooting Jan. 18 and is expected to produce enough episodes to run through 2011, when the star's contract expires.

In the Disney Channel show, she plays the dual role of average teen schoolgirl Miley Stewart and famous pop singer Hannah Montana, concealing her real identity from the public.

Cyrus has made no secret of her desire to move on to more adult roles.

In fact, the series will incorporate some of Cyrus' struggles with her teen vs. adult roles.

Disney Channel Worldwide's Adam Bonnett told the New York Post that the season-three finale, "Is Miley Saying Goodbye?," is "a big one-hour event where we find out what Miley Stewart's decision is going to be." That episode will air in mid-March.