December 5, 2006 -- WILL Jay-Z and Beyoncé Knowles finally tie the knot during his "surprise" 37th birthday party next weekend? Knowles, Jay and some Def Jam executives were at STK on West 12th Street on Saturday talking about the four-day "party" - but insiders say it will be more than a birthday celebration. "Beyoncé is throwing Jay a four-day birthday party, but it's really a wedding," said one source. Guests, including family and close friends, were told to have passport applications filed by last Friday so they can attend the bash on a yacht in St. Barts. But insiders said the guests will also be ferried over to Anguilla for the wedding at Cap Juluca, a five-star resort with Moorish villas. Another spy said Knowles and Jay-Z had toured the site earlier this year and approved it for their nuptials. Reps for Knowles, Jay-Z and Cap Juluca didn't return calls or e-mails. The rapper/mogul has dated the lovely Knowles, now bigger than ever with her star turn in "Dreamgirls," for four years.

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