The FCC on Friday defended its decision to impose a hefty, $550,000 fine on CBS for the Janet Jackson breast-baring incident during the halftime show at the 2004 Super Bowl. In a brief filed with the U.S. Court of Appeals for the Third Circuit in Philadelphia, the commission rejected CBS's claim that it was unaware that the incident would take place, had chastised the participants, and had apologized to viewers. The FCC pointed out that on the website of the show's producers, MTV -- then a corporate sibling of CBS -- promos had been promising that something shocking would occur during Jackson's performance. The FCC observed that Jackson -- and, Justin Timberlake, her partner in the performance -- were essentially CBS employees and that the network was therefore liable for their conduct.