The former TOWIE star arrived at London restaurant Gilgamesh with her friends ready for a fun night - and, as usual, oozed class in her outfit.
After asking her Instagram followers for advice on what dress to wear before her evening of festivities, Lucy chose a striking Valentino dress - and we definitely approve!
With white collar and bow tie, pink lace top and purple and red skirt, the unusual dress was the perfect choice for the birthday girl to stand out with on her special day.
The bow collar floral lace bodice frock may come with a heavy price tag at more than £2,000, but we bet Lucy felt like a million dollars in it!
Lucy's birthday isn't actually until 24 August, so we think this glam evening might just be the first of many celebrations for the designer...
No doubt boyfriend Louis Smith has something romantic up his sleeve, too.
Lucy and Louis have been dating for over six months now, with the Essex beauty finally coming clean on their romance earlier this year.
Since going public, the pair have seemed nothing but loved-up together. While Lucy has declared Olympic medallist Louis to be the "best boyfriend ever", he has admitted he is hoping for a long future with Lucy - including having some "little Lucy's".
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