It's celebrity switcheroo on Lower Fifth Avenue! Braden Keil reports that Julia Roberts' four-bedroom apartment at 43 Fifth Ave (@ 11th Street) that's been on the market for $4.995 million has gone to contract. The buyers? Ellen Barkin and husband Ron Perelman, who already own a sizable Upper East Side townhouse. Keil notes that the new apartment "could be the least opulent digs the cosmetics mogul has purchased in some time." Inside, the floorplan?and the kitschy kitchen!