The fashion blogger is currently in France for Paris Fashion Week, and earlier today (9 July) she stepped out at the Elie Saab Haute Couture Fall '14 show, showcasing a barnet which looked a lot blonder than usual.
Back when she shot to fame on The City, Olivia rocked a beachy blonde highlighted mane, but for the past few years she's opted for a glossy chestnut brown hue.
But now it seems the fashionista is experimenting with her hair colour once again, flaunting long, tumbling tresses adorned with shades of gold and caramel blonde.
The socialite styled her locks in a middle parting with the lengths tonged into effortless tousled waves, topping her look with flawless skin and rosy lips.
She also hit the mark on the style front too, donning a super-chic monochrome printed ensemble teamed with a tailored blazer, diamond-clad heels and a racy red manicure.
But unfortunately we didn't quite get a glimpse of the starlet's wedding ring - Olivia married model Johannes Huebl in an intimate ceremony in Bedford, New York, at the end of June.
Never one to follow the fashion rules, Olivia decided against wearing a traditional wedding dress, instead pairing a cream cashmere jumper with white shorts, plus a stunning tulle skirt overlay and royal blue Manolo Blahnik heels.
And of course, she still looked totally amazing.
What do you think of Olivia's blonde hair? Let us know by commenting below as the best comment across the site each week wins £50!
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