LOS ANGELES - US teen queen Britney Spears, who stunned fans with her secret wedding last weekend, faked the marriage amid a row over her pre-nuptial contract with her fiance, Us magazine said.

The American weekly claimed in its October 4 edition that it had obtained documents signed by the 22-year-old pop diva and her beau Kevin Federline, 26, stating that Saturday's marriage was held as a "faux wedding."

"Britney Spears and Kevin Federline ... agree that they intend to participate in a 'faux' wedding with one another on September 18, 2004," a document signed by the pair on September 14 states, according to Us magazine.

"However they do not intend to and shall not validly marry one another on said date," the four-page document reportedly said.

Us quoted a draft copy of a pre-nuptial contract between the pair that said they intend to marry -- for real -- on October 16.

Spears representatives were not immediately available for comment on the report that said the couple had not yet filed a marriage licence with Los Angeles authorities following the wedding at a friend's home.

But rival People magazine, which had excusive US rights to photographs of the Spears-Federline wedding, however insisted that the marriage was the real thing.

The wedding was billed as the singing sensation's second in just nine-months, following an impromptu 55-hour Las Vegas marriage to a childhood friend in January that was soon annulled.

But Us claimed that the multi-millionairess pop idol and her reportedly impoverished back-up dancer fiance, who announced their engagement in June, decided to put it off marrying until they could hammer out a mutually acceptable legal agreement over how to share their assets.

Under California law, couples can be forced to split their wealth 50-50 when they divorce unless a pre-nuptial contract divvying it up in a different way is signed before they wed.

The magazine said it had obtained a draft of a pre-nuptial contract stipulating that if the couple split, Federline would only be entitled to 300,000 dollars a year for exactly half the term of the marriage, instead of 50 percent of Spears' total wealth.

Under the draft contract, Spears, who is worth anywhere from 32 to 100 million dollars according to various reports, would also not be financially responsible for Federline's two young children by another woman.

Us magazine claimed that in addition to the wrangling over the pre-nuptial agreement, that Spears had reportedly been loath to make Federline sign, Spears wanted to avoid possible leaks by Federline's relatives to the press ahead of her real wedding next month.

Meanwhile the NY Post writes: Whoops! Britney didn't do it again.

The pop tart told the world she got married late Saturday night - but legally, she is still a swinging single.

Spears' rep, Leslie Sloane Zelnick, who had thought the singer was offi cially married, told The Post:

"Her marriage is not technically legal. But as far as Britney and Kevin [Fe derline's] union is concerned, it is a marriage and they are married. The papers were filed, but because the wedding date was switched so quickly, they didn't come through, and the marriage hasn't become legal yet."

Another source said when - and if - the papers do come through, Britney will not stage another white-dress wedding when she's officially and legally married next month.

"This was it; she had her wedding," the insider said. "In her mind it was her wedding, with or without the marriage license."

Us Weekly said Spears' prenup caused the "technical" delay, as Federline was "unhappy with how much he stood to gain if the marriage dissolved."

The prenup gives Federline only "$300,000 a year for exactly half the tenure of their marriage" - a pittance, considering Spears' $32 million bank account.

Other bombshells in the document, according to the magazine, include:

* "Britney shall have no financial obligation to contribute to the support of [Federline's] two children."

* Any gift worth more than $10,000 either gives the other "requires a legal document [stating] who will own it if they split."

* Should they split, Federline is not allowed to kiss and tell.

Oddly, the prenup also states Spears "represents to her knowledge she is not pregnant."

It also states that the wedding on Sept. 18 was meant to be staged and that [the couple] intend to marry on Oct. 16.

As first reported by The Post, Spears initially did not even want a prenup, saying she and Federline were so in love she didn't need one.

But after pressure from her mother, father, manager Larry Rudolph, lawyers and Jive Record executives, Spears agreed to have a one drawn up.

Federline, who was so broke in July his car was repossessed, apparently didn't take the news so well.

Originally, Spears was only going to give him $36,000 a year, which caused a huge fight between the two. After they made up, the prenup was amended on Sept. 17 to give him the higher amount.