The couple have a date in mind and scouted venues while on a recent break in Hydra.

“Both want a low-key ceremony with a handful of friends and family. The plan is to head back to London to celebrate with a larger group.”

They are aiming to tie the knot before Christmas, but Kate is waiting to finalise her divorce from Jamie Hince before sending out the invites.

A pal said: “They fell in love with Greece after jetting there last month and got the ball rolling by planning the wedding while out there.

The supermodel, 42, and aristocrat Nikolai, 29, who started dating last summer, spent three and a half weeks in Greece.

They were joined by friends including the Duchess of York Sarah Ferguson, Kate’s ex Jefferson Hack and her daughter by him Lila, 13.

Kate had not touched booze for three months before the holiday but pals say Nikolai led her astray.

The source added: “They are a volatile couple. He took her late-night drinking and they argued several times. Her pals are concerned he’s leading her off the straight and narrow.”

Kate’s choice of Greece comes after she and ex Jamie spent part of their 2011 honeymoon on a yacht off Kefalonia.

Радио плеер