Her vintage-inspired collection for M&S, launched in August 2012, quickly went on to become the store's bestselling lingerie line - ever.
And now, as Devon-born Rosie releases her latest collection accompanied by a series of to-die-for shots of the lingerie modelled by RHW herself, that success shows no sign of abating.
There are the usual romantic touches we have come to expect from Rosie for Autograph: pretty flourishes and finishes inspired by Rosie's own collection of vintage lingerie, or by the many thousands of sets of underwear she has modelled during her career.
'We wanted to create a luxurious collection of lingerie that would be perfect for Valentine’s Day and embraces a woman’s femininity making her feel utterly beautiful, whether she is treating herself or receiving a gift from her partner.'
Rosie says her favourite piece is the Amethyst Silk Plunge Bra and Brief set, which she says is the 'signature style' from her collection in a 'beautiful and flattering jewel colour.'
Soozie Jenkinson adds: 'Rosie and I put romance at the very heart of this collection, taking inspiration from the decadence and faded beauty of Rococo art and the decadent spirit of Versailles
Despite admitting she is inspired by other designers, there is no doubt that Rosie's collections, which she says 'exude feminine glamour' and feel 'exquisite' to wear have developed their very own flavour.
Soft-focus and sexy, whimsical and dreamy - yet, remember this is Marks & Spencer's bestselling lingerie range of all time - eminently wearable too.
Simply put, the M&S shopper is not a fool. They will buy the £12.50 knickers and £25 bras not because a celebrity tells them to, but because they genuinely like them.
And that, as well as those coltish limbs, that hair, and those beautiful pictures, is the secret to Rosie's success.
Because yes, we all want to look like Rosie. But even more than that? We want to wear comfortable pants.