If its not on eonline, I won't believe it h:

edit* although eonline had this to say:

STILL WED: Jessica Simpson and Nick Lachey issuing a joint statement through a rep, denying reports from Us Weekly and Life & Style that the couple has ended their union. "Nick and Jessica have not separated," the rep said. "Rumors to the contrary are simply not true."

FATHER KNOWS BEST: Joe Simpson also telling E! News exclusively that the reports of the demise of his daughter's marriage are false. "Not true," Simpson said.