But there's no argument over how beautifully healthy and glossy her new brown hair looks.
And whether your locks are naturally brown or colour treated, we've got the perfect product to keep it looking its best.
John Frieda's Brilliant Brunettes is one of our favourite haircare ranges, never failing to leave hair shiny and in good condition.
And now the range includes Lustrous Touch Smoothing Shampoo and Conditioner, £5.49 each, which are perfect for helping create luscious shine and smoothness.
As John Frieda's creative colour director, Nicola Clarke, who works with famous brunettes including Maggie Gyllenhaal, says: "Most people think that texture only impacts the way hair feels.
"However, it affects how hair looks, too, and the richness of its colour. If hair feels dry and brittle, even the most beautiful colour will look dull and lifeless."
So the new additions to the Brilliant Brunettes range have been developed with 'satin finishers' containing jojoba oil, coconut oil and silk amino acids to smooth each strand and improve texture.
Targeted moisturisers add satin gloss so hair feels and looks soft and smooth.