DESCRIPTION: (from ABC's press release) After C.J. discovers that Cate may be starting a clandestine relationship with Principal Gibb, he blabs it to Bridget. An angry Cate gets even by having Gibb put C.J. in charge of the detention of students on Ditch Day, and C.J. gets even by detaining Bridget. Meanwhile, because she is stuck in detention and can't complete the ditch day prank herself, Bridget convinces Kerry and Rory to steal the rival school's mascot. Nicole Richie ("The Simple Life") guest stars as one of Bridget's fellow detainees, on the Season Finale of "8 Simple Rules," FRIDAY, APRIL 15 (8:00-8:30 p.m., ET), on the ABC Television Network.