How do we know? Because she's posted not one but two Instagram snaps raving about it in the last five days! OK Mills, we get it!
Last week, the former Made In Chelsea star was living it up in Monaco with former beau, Hugo Taylor.
And while lapping up the sunshine, the pair confirmed their romance was most definitely back on by sealing it with a kiss and posting a snap to Millie's Instagram feed just a week after she divorced from Professor Green.
Keep up, people!
Along with all this love life drama, Millie also took to sharing her love of a certain hair styling product as she posed in the port of Monaco on Friday (28 May).
"Beachy waves today using @johnfriedauk sea salt spray, my hair smells like summer!" she posted, along with the tousled hair photo below.
Just four days later, Millie was back in London and still infatuated with the same hair product.
"Using my favourite @johnfriedauk product for beachy hair on set yesterday," she wrote on Wednesday (1 June) along with an in-action, behind-the-scenes snap (top).
So what is this product that's getting her all in a tizzy? None other than John Frieda Beach Blonde Sea Waves Sea Salt Spray, £5.89, boots.com which smells like coconuts and gives hair a fabulous, tousled look with very little effort.
Our kind of hair product.
For the best results, use it on towel-dried hair, then allow it to dry naturally while twisting sections every now and then to create soft waves.
We also love Fudge Urban Sea Salt Texturising Spray, £7.29, boots.com which gives a similar beachy look to your hair, minus the cost of a flight to the actual beach!
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