Is this Prince Harry’s last royal confidante?
They are considered the closest of all the British royal cousins, whose bond runs much deeper than family ties.
Princess Eugenie and Prince Harry were considered the "closest of friends" who used to party together at London nightclubs, and were often spied chatting with each other at official royal family engagements.
Fun, fiercely loyal and brutally honest, Eugenie doesn't hold back when it comes to her cousin Harry - setting him up with one of her close friends during their party days, and going on secret double dates with Harry's then-girlfriend, Meghan Markle.
"Out of all the Queen's grandchildren, Harry and Eugenie have one of the most natural connections."
"Like Harry, Eugenie is loyal, honest, and great fun. The two had many nights out together in London."
Such was their social bond beyond the royal fold that Prince Harry, 35, even dated one of Princess Eugenie's best friends, Cressida Bonas.
And years later, Princess Eugenie, 30, was said to have been the first royal relative that Harry told about his romance with then-Suits star, Meghan.
"Harry had always confided in his cousin when it came to the women in his life," the biographyFinding Freedom revealed.
"Not only did he trust her implicitly, but friends say that she gives great advice and has always been 'beyond wise' for her years," the book's authors Omid Scobie and Carolyn Durant wrote.
"It's not surprising, then, that Eugenie was one of the first in the family to know about his relationship with Meghan.
"Although she was the one to introduce Harry to her good friend Cressida (Bonas), she was nothing but encoring about his new relationship.
"In fact, Eugenie, who'd long wanted to see her cousin settle down and be happy, told friends she loved Meghan and that she was 'just the tonic' for him."
Princess Eugenie and Brooksbank went on double dates with Harry and Meghan in Toronto, including on Halloween in 2016, while their relationship was still a secret.
Brooksbank was there at the time, on work trip as part of his role as a commercial manager for Casamigos - the $700 million tequila brand founded by George Clooney and Rande Gerber.
"Harry and Meghan had already been out on two double dates with (Eugenie and Jack)," a source said, of the time when Harry and Meghan were dating in secret.
But one memorable night out - a masquerade Halloween ball double-date - ended early for Harry and Meghan, who left the party early after they learnt details about their relationship were about to break in the UK press.
EUGENIE SET HARRY UP WITH EX
Long before she supported Prince Harry's relationship with Meghan, it was Princess Eugenie who introduced Harry to his ex-girlfriend Cressida Bonas the former British "it" girl turned actor, in 2012.
The pair went on to see each other, on and off, for two years until 2014, when their split for a final time. It was reported that Cressida, 31, broke Harry's heart because she didn't want the "unwanted attention" that marrying a royal would have entailed.
"Cressida had a hard time dealing with the focus of attention being on her all of the time just because she was Prince Harry's girlfriend - not because she was herself," a source told People at the time.
Despite the romantic setups and double dates, it hasn't always been smooth sailing for Harry and Eugenie.
At her wedding to James Brooksbank, Eugenie was said to have been less than impressed that Harry used her big day to announce Meghan's pregnancy.
"It did not go down particularly well with Eugenie, who, a source said, told friends she felt the couple should have waited to share the news," Finding Freedom states, according to People magazine.
Just where Harry and Eugenie's close cousin bond sits now - given Prince Harry's Megxit-fuelled relocation to Santa Barbara, California - remains unclear. However, it is understood Princess Eugenie and Brooksbank will visit the couple as soon as travel restrictions are eased.
Originally published as Is this Prince Harry's last royal confidante?