Found: Pics Of Glammed Up Meghan and Kate At A 'Secret' Royal Event

The Duchesses couldn't have dressed more differently.

The Duke and Duchess of Sussex stepped out on Thursday to attend a top secret black tie event, their third evening out in a row this past week.

This time the newlyweds were joined by the Duke and Duchess of Cambridge, and while details on the exclusive nighttime soiree are scarce -- as are official photos -- we do know it was an annual dinner for the Royal Foundation held at London’s Victoria House.

But if Harry, Meghan, Will and Kate thought they could slip under the radar entirely then they were sorely mistaken!

Scottish singer Tom Walker performed for the royals, and later -- thank heavens -- he shared some snaps of the fab four on his Instagram.

Prince William looked slick in a tux, while his wife Kate literally shone in a bright red pleated frock with an asymmetrical neckline.

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It might look familiar -- to serious Kate fans at least -- as the 36-year-old previously wore the Preen number to an engagement in Canada in 2016. We love how K-Midd recycles her most valuable wardrobe pieces.

Her sister-in-law Meghan, however, opted to keep things more demure -- in terms of colour at least -- in a black Roland Mouret gown with floral detailing on the skirt.

The differences didn't end with the dress' hue, either. While Kate's frock was almost-but-not off-the-shoulder, mum-to-be Meghan's was instead completely strapless, and had a v-cut out at the neckline.

In terms of hair, one Duchess (Kate) went for her signature bouncy curls, while the other (Meghan) swept hers back into a low chignon. needless to say both looked flipping incredible.

The past week has been one filled with surprise outings for the royal quartet, and we just can't get enough of it.

On Tuesday evening newlyweds Haz and Megs popped their glad rags on for a secret black tie event at Kensington Palace. The event was in honour of the wildlife conservation charity Africa Parks, of which Haz is the president.

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While no official photos were released a few sneaky pics did leak on social media showing Meghan in a black boat-neck dress -- one of her go-to styles.

She finished off her look with a black Gucci clutch and a pair of gold leaf earrings by Pippa Small. You might remember her first wearing the bling in Fiji while on the recent royal tour.

The Duke and Duchess of Sussex were joined by Harry's brother Prince William and his wife Kate the following evening to celebrate Prince Charles' big 70th birthday.

Again, there were no snaps -- official or otherwise -- from inside the glitzy event held at Buckingham Palace on Wednesday but the fab four were seen zipping into the grounds in their cars.

Diamonds are a Duchess' best friend. Image: Getty.

We caught a glance at sisters-in-law Meghan and Kate's OTT earrings -- how much did they weighh, let alone cost?? -- but the rest of their outfits largely remained a mystery. Sigh.

Will we see any or all of our fave royals out and about again before the end of the week? Here's hoping.

Feature image: Instagram/@iamtomwalker.