In an e-mail to AP, Simpson representative Brad Cafarelli reiterated: "They have not separated."
Alex Dudley, a spokesman for Us Weekly, told AP the magazine was standing by its story. The latest issue, which hits newsstands Friday, proclaims "Split!" on the cover.
For the past year, rumors have plagued the high-profile couple, who will celebrate their third anniversary Oct. 26. Magazines have run pictures of Simpson with and without her wedding ring, and there have been tabloid reports of an alleged fling between the blonde star and her Dukes of Hazzard co-star Johnny Knoxville, which both have flatly denied.
As recently as August, Lachey denied any impending split, saying everything was "absolutely wonderful," AP reports.