Britney is upset over the new conservatorship ruling

Pop superstar Britney Spears is upset over the new conservatorship ruling which extends her father Jamie's power over her life.

A source said: "Britney is very upset about the conservatorship being extended. She feels very duped by the people around her."

The ruling didn't specify an end date for the conservatorship, though lawyers have said they expect Spears' father to be in charge for another six months to a year.

The next Spears family hearing is set for January 14.