The New York Post reports Dan Klores resigned as publicist for Britney Spears after the singer put several of his relationships with other clients in peril. “Dan had made a deal for Britney with [NBC head] Jeff Zucker for her to go on NBC,” a source revealed. “She canceled it and went to ABC. Then Britney was supposed to be on the Esquire cover exclusively – and she appeared on three other magazines’ covers. [Esquire editor] David Granger was furious. It was crazy.” Klores confirmed the two had split but declined to comment on the allegation.