In an O. Henry twist, the hotel on Chicago's Gold Coast is the same place where Jennifer Aniston -- Pitt's ex -- sought refuge in 2005 when she and Pitt split -- after he and Jolie became an item.

Why celebrities gravitate to the Peninsula Hotel is simple, the Chicago Sun-Times reported Thursday. Since opening in 2001, the hotel provides the high level of service, state-of-the-art amenities and top-drawer security stars crave in keeping out of the public eye and the photographers' lens.

The couple requested nothing out of the ordinary for their estimated two-week stay.

"(They) are totally low maintenance and keep completely to themselves," a source told the Sun-Times, adding they just wanted information such as the nearest hospital emergency room, pharmacy and restaurants with kitchens that stayed open late.