Lady Louise Windsor wears blue velvet Ralph Lauren dress in unseen picture

A new photograph of Lady Louise Windsor, 19, surfaced on social media. The royal fan page @kingwilliam.and.queencatherine posted on Instagram: “New/unseen photo of Lady (should be Princess) Louise.”

Louise looked beautiful in what appeared to be a vintage Ralph Lauren navy blue velvet floor-length dress.

The £285 dress has blue removable straps with rhinestone detailing on the shoulders and a draping neckline.

Unfortunately, this dress is no longer available to purchase for royal fans who may wish to dress like Lady Louise.

The daughter of the Duke and Duchess of Edinburgh additionally accessorised with a white gold circle necklace with a suspended diamond.

The necklace which retailed from Avanti Fine Jewellery is also sold out, so it is unclear how much the jewel cost at the time of purchase.

Its description says: “A fine 18ct white gold necklace with an open circle diamond set pendant with a suspended drilled round diamond in the centre.

“The overall diamond weight is 0.17ct and the chain can be worn at 16 inches or at 18 inches.”

Royal fans thought Louise looked splendid and took to social media to discuss her latest look.

Twitter user @panto12 said: “What a lovely picture! She looks beautiful here and she really is growing up!”

Royal fan @GraceandThanks added: “Wow! She looks amazing.” Social media account @brozovicbasic commented: “Wow, she is a beautiful young woman and a real credit to her parents and wider family!”

Another fan @DuchessH6 wrote: “She looks so much like Zara in this photo.”

Royal watcher @mog1717 said: “She’s become quite lovely. Love her natural look. When you have that skin and face you don’t need a ton of makeup.”

One fan @lovefamilywales added: “Wow gorgeous! She looks so much like her mother.”

Social media account @Mainly_Musing commented: “What a beautiful young woman she has become, and I suspect beautiful on the inside, too.”

Instagram user @teachkinder01 wrote: “Elegant and classy. Love Lady Louise.”

Finally @k.c8989 said: “Lady Louise is absolutely gorgeous. What a beautiful young woman.”