Maine and I already have our tix for the new Princess Diana exhibit bowing this month at the Constitution Center, and can’t wait for its invite-only soiree on the 2nd. (Guest of honor: Charles Spencer!) I’m wearing a hat — so Camilla Parker-Bowles! … Who is the mystery client at 10 Rittenhouse whose penthouse is getting a pricey makeover from interior-designer-to-the-stars Gregory Augustine? The design community buzzes. … Is Savona the new Parc? Nightly shoulder-rubbing by the likes of ad guru Marc Brownstein, campus apartment mogul David Adelman, and Maurice and John from OMG (checking everyone’s ’dos, no doubt) has turned it into the Main Line’s premier dinner party. … Lastly, Penn Maid heiress Robin Batoff and her hubby, real estate czar Jerry, just threw a fab party at their Villanova digs to celebrate … their divorce! There’s amicable and then there’s amicable, darlings.