But how does she get her brunette 'do looking so luxe, we hear you ask?
Well ask no more, as we've got the lowdown on her haircare secrets!
The City star leaves her barnet in the capable hands of celeb stylist Mark Woolley, who is the founder of Electric Hair and This Morning's new Style Squad hair expert.
And Mark has revealed the exact products he uses on Olivia, along with a simple step-by-step guide to get her look at home.
You can thank us later!
1. "Start by applying a lightweight prep product like C-2 Electric Smoothing Cream, £17, through damp hair, ensuring you coat every strand from root to tip," says Mark.
"I use this to make Olivia's hair smooth, as light bounces off smooth surfaces, making them look shiny."
2. " Create a centre parting and apply C-5 Electric Hair Volume Mist, £18.95 (exclusive to Fortnum & Mason), before blow-drying small sections of hair with a Denman Head Hugger Brush, £8.87.
"Make sure you keep your hair taut and hold the hair dryer nozzle high, facing down the hair shaft. This will help to prevent flyaways."
3. "After the hair has cooled, spray a mist of L'Oréal Professionnel Tecni Art Crystal Gloss, £8.10, all over your hair. As well as helping to create a mirror-like shine for your hair, this spray helps to prevent frizz, keeping it soft and smooth all day long.
"Finish by smoothing down any stray hairs with the flat back of your hair brush."
And there you have it - three easy steps to Olivia-worthy tresses!
Will you be taking Mark's tips and recreating Olivia's hair at home? Let us know by commenting below as the best comment across the site each week wins £50!