Meghan Markle‘s first solo outing with Queen Elizabeth II is one that will forever be remembered.

The Duchess of Sussex accompanied Her Majesty to three royal engagements in Cheshire, England, on Thursday, and judging from the pics, it appears the two have become instant royal besties.

But there’s so much more to their newfound friendship than meets the eye — and royal expert Katie Nicholl is breaking it all down for ET!

“I think today’s engagements, this was the first away day for the queen and Meghan together, signaled just how warmly Meghan has been welcomed into the royal fam,” Nicholl said, when asked what makes their latest outing so special. “It’s unprecedented, actually, for the queen to take such a new member of the royal family on the royal train.”

“She didn’t do that for Kate [Middleton],” she continued. “They traveled on a regular train, albeit in first class, when the queen took Kate on her first away day, and Kate had to wait nine months before the queen invited her away. So, Meghan has been taken away within her first month of being married, aboard the royal train, and I think you only needed to look at their body language and the warmth between the two of them to see just how warmly embraced Meghan…