Model Rosie is already the face of Autograph (and many other things) but this lingerie line represents her first foray into design.
"I'm very excited," said Rosie of the announcement. "I thoroughly enjoyed collaborating with the design team to create my dream collection, and I'm looking forward to a fun and creative time ahead."
And M&S are equally enthusiastic. Kate Bostock, the executive director of clothing for the brand, added: "She really understands beautiful lingerie and what works on the body."
The Rosie for Autograph collection comprises 33 pieces and includes rose prints, presumably for the collections namesake.
You'll be able to get your hands on Rosie's smalls from Autumn 2012.