Thee weeks after I revealed details of their affair, Park Avenue heiress Tinsley Mortimer came out of her bunker at the weekend to make her public debut on the arm of her aristocratic lover Prince Casimir 'Cassi' Wittgenstein-Sayn.
And, fittingly, the glossy couple chose a high-profile event to make their debut - the Cartier-sponsored polo at Smith's Lawn.
Following the break-up of her marriage to New York hedge-fund manager Topper Mortimer, Gossip Girl star Tinsley, 32, has been making secret trips from Manhattan to London to see Chelsea-based merchant banker Cassi. 'This was the first time they've "come out", so to speak,' a pal tells me.
German-born Cassi, also 32, whose family owns a castle in the Rhine Valley, has been keen to introduced his new love to his London friends.