Call us crazy, but we think this whole Meghan Markle-Prince Harry relationship is getting pretty serious.

We got this inkling back when the two first got together… and then it grew stronger last summer after Harry released a public statement that asks trolls to leave his girlfriend alone.

Then Harry went ahead and proposed to Markle.

And now with their wedding scheduled for May 19, we think there may be something really brewing between the former Suits actress and the hard-partying Brit.

It’s worth keeping your eye on at least.

The latest sign that Markle and Harry are more than a mere fling arrived on Monday morning when the star joined Queen Elizabeth II and the rest of the royal family in a first official joint engagement at Westminster Abbey.

As you can see above and below, Markle donned a creamy white coat by Amanda Wakeley over a dark dress and was joined, of course, by her fiance for the occasion.

Prince William and Kate Middleton also took part in the Commonwealth Day service, which is an annual inter-faith gathering broadcast live to celebrate the queen’s lifetime commitment to the Commonwealth.

Markle’s inclusion marks the latest example of her preparing to join this legendary group of relatives forever.

(For those interested:

The 91-year old Queen is head of the Commonwealth, defined as a global network of 53 countries with more than two billion people. This morning’s Abbey service is the largest annual interfaith gathering in the United Kingdom.)

Markle continues to make quite the impression in public.

She wears the perfect outfit. She says the perfect thing. She may very well have a perfect smile.

She’s even responded as maturely and as reasonably as one could to dangerous, racist attacks over the past several months.

Elsewhere, we’ve learned that Kate Middleton has organized an amazing bachelorette party for her soon-to-be-sister-in-law.

The impending festivities will include a great deal of wine and Dom Perignon champagne, a photo booth… and even karaoke!

“Kate is determined to make it an unforgettable occasion,” an insider tells In Touch Weekly, adding:

“There will be no expense spared. She wants Meghan to be reminiscing about it for years to come.”

For the record, this gathering will be a separate affair from Markle’s bridal party.

Moreover, Queen Elizabeth II, apparently will be a part of this wild and crazy get-together.

Writes the aforementioned tabloid:

“Those close to Meghan are already betting that the queen will surprise Meghan with some sexy underthings.”

This may be the single funniest rumor we’ve ever seen reported by a magazine.

We’ve been wrong at least once before, but we somehow doubt the Queen will be gifting Markle with any sexy underthings prior to her wedding.