The supermodel - who reaches the milestone age on January 16 - has jetted out to his Necker Island paradise with her husband Jamie Hince, but it is said close friends will also join them for the party.
An insider told the Sunday People newspaper: ''Kate didn't want the fuss and bother of London and the drama that comes with it She's decided to celebrate in private.
''It'll be wild though - guests have been told to bring fancy-dress clothing, party gowns as well as beachwear.
''She is absolutely delighted Richard gave her the sole use of his island, she is so touched by his generosity.''
It is said while Kate wants to enjoy a ''relaxing'' break in the British Virgin Islands, she has every intention to have a ''massive'' bash on her ''actual birthday''.
The source added: ''She is planning a nice, relaxing holiday but, at the same time, her actual birthday will be a massive one, just like everyone is expecting.
''Kate has vowed not to let her friends down, she knows how to throw a good party and this will be no exception.''
The latest tour and festival announcements for September 24th 2021.
Have a spookily musical Halloween this year.
When Brighton based musician Jonny Wildey is not creating sounds under the nom de plume of Alphabets Heaven he's embracing "a more traditional form...
Courtney Love went from Faith No More to Pagan Babies before roles in Sid And Nancy and Straight To Hell propelled her forward to form her seminal...
Returning with their first new song in five years, Placebo have just dropped ‘Beautiful James’ as the first taster of their forthcoming album.
Tour and festival announcements for September 17th 2021.
The Cheshire four-piece unveil a new politically-charged single entitled Show & Tell.