Hilary Duff's father, Bob Duff, has been sent to prison for ten days after being placed in contempt during a divorce hearing, People is reporting. Mr. Duff and his ex-wife, Susan Duff, had been arguing about payment for Hilary's 21 birthday bash during the hearing and Mr. Duff was eventually put in contempt for violating a court order prohibiting him from selling assets without the consent of his estranged wife.