BET has suspended a producer after a joke about Beyonce and Jay-Z’s daughter that aired Monday on the network’s music video countdown show, “106 & Park.” A source at the network, who spoke on the condition of anonymity because the person was not allowed to discuss the matter publicly, said the producer was suspended after an on-air remark about 2-year-old Blue Ivy’s hair. Stephen Hill, BET’s president of music programming and specials, publicly apologized on Twitter.