With a contrast white collar and sparkling crystal buttons, it's certainly a spot on Duchess dupe - and at £350, it's considerably cheaper than the royal's designer dress, too.
Holly rocked her polka dots to return to This Morning
Posting a snap of her outfit on Instagram as usual, Holly wrote: "Morning! HNY! ... Hope you're ok and if not... that’s ok too... let's get through it day by day... we've been here before, we can do it again... missed you and looking forward to keeping you company again... see you on @thismorning at 10am... Dress by @lkbennettlondon."
WATCH: Holly's chic style rules
Plenty of fans quickly reacted to the elegant look, with one writing: "Cracking dress Holly. Love it... Welcome back," and another adding: "Stunning as always."
Duchess Kate's collared Alessandra Rich dress was one of her most memorable outfits back in 2019, and has sparked a number of similar trends.
Kate's Alessandra Rich dress is loved by royal fans
Kate wore the elegant navy spotted dress, priced at £1750, for a visit to Bletchley Park in the May of that year – the same outfit she donned for the royal family's official portrait to celebrate Prince Charles' 70th birthday months earlier.
The exact dress was also worn by Suits actress Abigail Spencer at the wedding of the Duke and Duchess of Sussex - and was rocked by other stars including Sarah Jessica Parker.
Mathilde dress, £350, L.K.Bennett
It's also been compared to Princess Diana's iconic style, and designer Alessandra Rich has even revealed that the late royal was one of her inspirations.
Princess Diana loved her polka dots and contrast collars, too
She revealed to The Telegraph: "She wore polka dots so well and I know all of her looks by heart."
As a known fan of Kate and the royal family, we're not surprised Holly was as in love with the dress as the rest of us were!
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