Rehab alum Lindsay Lohan has lined up a boozy sponsorship for her upcoming 21st birthday. A rep for Svedka vodka confirmed yesterday that they are backing Lohan's July 2-3 celebrations in Vegas in a deal that could net the Georgia Rule star up to seven figures. Other partners include PURE nightclub, a "specially-designed" suite at Caesar's Palace and the Social House restaurant. "This should be one of the best parties ever," Lohan's lawyer added after he confirmed the vodka deal. As to having the AA attendee's party footed by an alcohol brand, the star's rep said, "I am unaware of who is sponsoring Lindsay's birthday, as I am not the one planning it."