In a hearing at London's High Court which lasted less than a minute, District Judge Anne Aitken granted Nigella Lawson and Charles Saatchi a decree nisi - the first legal step to ending their 10-year marriage.
Saatchi, 70, and Lawson, 53, now have to wait for a decree absolute, which is usually issued six weeks and a day later, ending their marriage.
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Colo became a mother of three, grandmother of 16, great-grandmother of 12 and great-great-grandmother of three.
The district's director of homeland security has said officials are planning for 800,000 to 900,000 people to attend the ceremony.
The Supreme Court is set to decide on whether disabled travellers are legally entitled to have priority use of wheelchair spaces on buses.