Amid the controversy over their weekend nuptials, Britney Spears and Kevin Federline have admitted that they're not legally wed ... yet.

While Us Weekly claims in its next issue that the couple's wedding on Saturday was faked, Spears and Federline told People magazine that they have yet to file their marriage license, but plan to do so next week. They say they were prevented from doing so in advance because they had moved up the date of their ceremony.

"I know we're not completely legal until we file the license," Spears told People, "but in a real sense, in a spiritual sense, we're married ... I believe you also marry in your heart and that means much more than a piece of paper. If I don't feel it there, then nothing else matters. You can write anything down on paper, but the real truth is love. We know we have that."