The reality TV star, 24, arrived at Julien Macdonald's catwalk show (13 September) wearing one of the designer's own pieces - and totally rocked it!
Rosie looked every inch the fashionista in the cutout black dress which flashed plenty of her English rose skin.
And the blogger even admitted she wasn't able to wear any underwear with the risqué outfit... Naughty but nice, Rosie!
Alongside a photo of herself in the skintight mini-dress, Rosie wrote the message: "LOVED wearing this insane dress to your show @julienmacdonald and of course a popsicle by @charlottesimone_ to slightly cover my dignity and @katmaconie shoes. #nounderwear."
Teamed with a black and turquoise 'popsicle' - aka a fake fur scarf - and towering black heels, Rosie's outfit fitted in perfectly with the on-trend audience.
Rosie attended the glamorous event at London's Royal Opera House with pal and former Made In Chelsea star Millie Mackintosh.
Millie also stunned in a little red Julien Macdonald number, which flashed just the right amount of tanned skin.
After watching the show, Rosie tweeted her approval to the famous Welsh designer, saying: "WOW @JulienMacdonald what an absolutely stunning show!! #LFW."
Looking good girls!
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