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They're keeping it in the family, y'all!

A source tells X17online exclusively that Britney Spears' brother Bryan will marry his fiancee (and sister Jamie Lynn's manager!) Graciella Sanchez on New Year's Eve in New Orleans, Louisiana.

Of course, Britney and the rest of the fam will attend the ceremony, and we'll be bringing you even more details as soon as we get 'em!

Think Brit will be the maid of honor? And what if she catches the bouquet?! Oh, the possibilities are endless!