We spotted Michelle Keegan rocking a very similar number as she celebrated her 27th birthday back in June.
Rosie donned her version at the UK launch of TheHunt.com - an online community that helps fashion lovers track down clothes they're coveting.
The Chelsea girl, who is the brand's ambassador, kept things neutral with nude pointed heels, the only pop of colour being in her statement red pout and matching clutch!
Former Coronation Street star Michelle kickstarted the trend earlier this year as she headed out to London's Shaka Zulu restaurant.
She upped the glam factor, pairing her dress (from her own collection at Lipsy, £55) with metallic heels, bronzed pins and bling earrings.