Britney Spears' father has banned his daughter from going out without a bra.

The '3' singer - who is still under the conservatorship of her father Jamie Spears following her widely-publicised breakdown in 2007 - has been warned she needs to improve her public image which is why he has imposed the bra rule and threatened to sack any member of her security who lets her slip out without underwear on.

A friend said: "Jamie's control over Britney's life is incredible. He hates the pictures of her with her nipples all over the place so he has banned her from leaving the house without a bra. He wants her to put across the right impression. One security guard is told he is close to getting fired because he lets her go out without her bra."

The 57-year-old patriarch - who has control of the singer's finances - has also been deemed responsible for the end of the pop star's relationship with 38-year-old talent agent Jason Trawick, who she split with at the end of February.

The friend added to The Sun newspaper: "It was also Jamie who made her split with Jason. He likes Jason but their relationship was too intense and volatile. He feared it was sending her back to her old ways. He warned her, 'It's Jason or your children.' " Britney, 28, has two sons, Sean Preston, four, and three-year-old Jayden James, with ex-husband Kevin Federline.