Rosie kicked off her style-a-thon with a sleek all-black outfit, featuring an on-trend sheer shirt and black tuxedo trousers.
The 26-year-old was in London at a dinner to promote her new sleepwear range for high street giant, Marks & Spencer.
Rosie ensured all eyes were on her as she arrived at London's Dover Street Arts Club last night (16 Oct) evening to celebrate.
The Devon-born beauty showed off her toned figure in the revealing top and finished her look with sexy black heels.
Wearing her hair in a sleek ponytail and keeping her make-up to a bare minimum, Rosie looked sensational.
But it was early to bed for the blonde bombshell, as she faced an early wake-up call for an interview on Radio 1's breakfast show with Nick Grimshaw this morning.
The star has tweeted: "Goodnight London. Tune into radio one in the morning, I'll be chatting to gorgeous grimmers x."
Despite her early start, Rosie managed to look as though she'd stepped straight off the catwalk.
The star opted for a more low-key ensemble of skinny jeans, a simple grey tee and chic black blazer. Rosie masked tired eyes with a pair of eye catching shades.
Nice work, Rosie!
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