Aristocrats are packing up in St-Tropez, Capri and Ibiza and breaking out dinner jackets for the fall social season.

Guests on both sides of the Atlantic are already buzzing about the impending nuptials of Lord Charles Spencer Churchill and Sarah Goodbody Sept. 19 at England’s Blenheim Palace.

The 18th century pile is occupied by Charles’ brother, the Duke of Marlborough and his wife, Lily. We hear the Duke’s ex, Rosita Spencer-Churchill, just returned from cruising Corsica with her kids. But first she’s expected as a guest at the 80th birthday of Oklahoma real-estate man Konrad Keesee, whose son, Christian, is throwing a four-day bash at The Connaught and sailing over American guests on the Queen Mary 2 on Wednesday, including 79-year-old former Vogue cover girl Fern Tailer.

Also attending, we hear, will be Princess Esra of Hyderabad, who’s planning her own upcoming bash for 90 guests at Falaknuma Palace, her former home.

The royal digs in India have been renovated with Taj Hotels and Resorts as a 60-room hotel.