The singer's father Jamie, who currently has control over her finances, is eager for her to maintain her focus as she continues on her world tour.
"Jamie is determined nothing can go wrong with Britney's comeback. He's making sure she reads the Bible for at least an hour during her quiet time before she goes on stage and has banned her from using the internet," a source told The Mirror.
"He is even monitoring what she eats by insisting on none of her beloved junk food on the rider.
"He's stopping her from leaving her hotel unless accompanied by a security guard and even though she gets on much better with her ex-husband, Kevin Federline, she isn't allowed to speak to him without Jamie or her manager there."
Friends of the singer recently denied rumours that she was dating talent agent Jason Trawick.