Admirers of Kate Middleton's fashion will unfortunately need to wait for at least a month if they want to have the same elegant dress that she is wearing in the latest royal baby photo of Prince George together with Prince William.

The fuchsia Jolene dress from British company Seraphine Maternity was officially tagged as "sold-out" two hours after the release of the photo.  The frock's design features a deep V-neck cut paired with a knot front. The gorgeous maternity ensemble can be purchased for a measly $79.

The Seraphine dress that she wore with floral prints en route to Bucklebury similarly sold out quickly.

Cecile Reinaud, Seraphine's founder, has proudly acknowledged the help of the duchess in boosting the maternity boutique's sales in Hello!: "The Kate effect is huge and we have been enjoying a 400% growth in sales since it became public that Kate bought Seraphine dresses back in April 2013."

Middleton's style has always been praised due to its sophisticated aura. The term "Duchess Effect" was even coined to describe the effect of the modern princess towards the fashion choices of women across the globe.

On Seraphine's website, the shopper can even see the duchess' three classy dresses for they carry the exclusive label "Worn By Kate Middleton". New stocks are expected to arrive mid-September. However, those items have been reserved already as well. The store has even released a notice saying, "Due to high popularity of this style, please be advised that orders will be dispatched week commencing 16^th of September."

Other clients of the 10-year-old company include then pregnant Angelina Jolie, Jessica Alba, and Jennifer Garner. Prince William's charming wife seems to be the client who has attracted the most viral attention.

Since the much-awaited royal birth, many fashion stores have tried to take advantage of the "Kate Effect" but only a handful became successful.