The 34-year-old – who's on maternity leave after giving birth in September – attended Wednesday night's Brits with her sister Kelly and best friend Fearne Cotton.
And she looked stunning in an eye-catching black dress with lace cap sleeves and a matching frilly trim that was finished off with red and white tassels.
Holly – who is also mum to Harry, five, and Belle, three, and who's in the running for Celebrity Mum Of The Year - wore her blonde hair in an elegant chignon style, teamed with smoky eye make-up.
Radio presenter Fearne – mum to two-year-old Rex – looked just as gorgeous in an embellished gold mini dress.
Holly shared a series of Twitter photos of herself and Kelly as they enjoyed their night out together.
- J E H (@jonford68) February 25, 2015
In one photo, she posed with actor RJ Mitte – the 22-year-old who played Walter White's son Flynn in Breaking Bad.
And in her final snap from the night, Holly's sister is seen beaming as she's showered with confetti.
The talking point of the Brits, of course, was Madonna's spectacular wardrobe fail when a dancer yanked her long flowing cape, sending the 56-year-old tumbling off stage (aka dodgy material, girl!).
Footage of the clip has gone viral and has been trending on Twitter ever since.
However, to show what a true professional the veteran singer is, she simply got up from her tumble, adjusted her cape, and carried on with her performance.
Watch Madonna's caped catastrophe here...