The former The Only Way Is Essex star swapped the cute, vintage-style dresses she often favours at glitzy events for a casual chic (but equally glam) look of jeans and lace top at the Casio Tokyo Trio Watch party in London on Monday night (28 January).
Lydia joked before arriving it could be a TOWIE-Made In Chelsea face-off as MIC stars like Rosie Fortescue and Amber Atherton were also scheduled to appear.
Aside from the reality gang, stars including Sarah-Jane Crawford and Take Me Out: The Gossip co-host Zoe Hardman were also in attendance.
We hope Lydia had a good night because she tweeted before heading out she'd be embarking on a health kick in the morning: "Better late than never starting my New Year's resolution tomorrow personal training, been putting it off for too long. Vegas body here I come x."
And, because we all need a little inspiration to get outside and get fit this time of year when it's cold and grey, it seems Lydia has chosen supermodel Miranda Kerr as her perfect body idol. She tweeted at her personal trainer: "Please make me look like this! #summerbody."
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