If the rumors are to be believed, Jay-Z and Beyonce are on the rocks, and the Post is adding fuel to the rumormongering fire by reporting that Queen Bey is "secretly shopping" around for a place of her own. She supposedly checked out the $21.5 million penthouse at 520 West 19th Street. The 4,054-square-foot duplex is less than half the size of the power couple's 8,309-square-foot Tribeca loft, the Post's anonymous sources say it "would seem clear" that the new home would be for Beyonce and Blue Ivy, their two-year-old daughter. The five-bedroom apartment last sold in 2008 for $9.1 million, and the current owners completely renovated; there's a double marble fireplace, a 20-foot-long library, teak floors, Venetian plaster walls, and a 642-square-foot terrace. Not too shabby for the most famous woman in the world.