On her Instagram stories, Queen Elizabeth II’s granddaughter wrote: “Goodbye, special friend.

You are so loved and missed.

Thank you for so many memories of laughter and fun.

Princess Eugenie and Michelle Trachtenberg pose at different events

You were so thoughtful and generous and soooo funny.”

Eugenie echoed Blake Lively’s words.

But one never knowswho the royals might befriend in Hollywood.

Michelle Trachtenberg and Princess Eugenie watch a basketball game

Where the friendship began

Details of how Princess Eugenie and Michelle Trachtenberg met are not publicly known.

At the time, Trachtenberg was 28 and Eugenie was five years her junior, at 23.

As a New York native, Trachtenberg inevitably rooted for her hometown team.

Princess Eugenie and Michelle Trachtenberg with friends

(The Knicks came out on top.)

Why was Prince Andrew and Sarah Ferguson’s youngest daughter in New York?

She had a three-month internship at the time with online art auction website Paddle8.

Michelle Trachtenberg took a selfie with Princess Eugenie

And what projects was Trachtenberg busy with?

She had wrapped her role as Georgina Sparks on “Gossip Girl” the previous year.

(It’s unclear how the group knew each other.)

A throwback photo of Michelle Trachtenberg and Princess Eugenie

This is one of many celeb-laden images that Trachtenberg posted to her Instagram.

This lady happens to be one of them.

Friends really do mean a lot."

Reportedly, Trachtenberg had also been lucky in love.

Less than two weeks before her untimely death, she posted a Valentine’s tribute to Cohen.

Had the relationship fizzled?

The actor did acknowledge her friend in aDecember 2020 Instagram post, however.

The Covid-era tribute was a throwback photo of the two.

She explained that she met “this wonderful human years ago in New York.”

I am grateful for the relationships I have made over the years."

It was yet another acknowledgement of the special relationship between two unlikely friends, Michelle Trachtenberg and Princess Eugenie.