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Since tying the knot to Prince Harry in May, Meghan Markle has been adjusting to life as a royal.

The 37-year-old has had to ditch her favourite "filthy and sexy food", as well as abide by a number of fashion rules to fit into her new family.

When it comes to dinner parties, table etiquette is important and the Duchess of Sussex must think twice about what she says.

And this even includes remembering to do a few things before running to the toilet.

So what is the golden rule that Meghan must stick to at the table?

According to the Business Insider, a member of the Royal Family must never “announce their intentions” when they leave the table.

But when dismissing themselves from the dinner, they have to say “excuse me” and leave.

However, there’s another thing they must remember to do if they want to have some food left when they return.

(Image: GETTY)

(Image: GETTY)

If they haven’t completed their plate, the royal will have to cross their knife and fork.

This isn’t to stop those around them from helping themselves but to alert the staff that they’re not finished eating.

And if they’ve licked their plate clean before nipping to the loo, they must put their cutlery at an angle, with the handles at the bottom right of the plate.

(Image: GETTY)

Following the Royal Wedding ceremony at Windsor Castle, Meghan has even had to give up certain make-up items.

According to her make-up artist, the Duchess has ditched her make-up routine by applying her own products.

And she’s even had to ditch her red lipstick as she opts for more neutral colours in public.

Her artist Daniel Martin said: “She likes to talk and she’s not a fussy person, so she doesn’t want to have to worry about anything.”