The former Pussycat Dolls singer took the top knot from day to night when she arrived at The X Factor auditions in London, leaving the rest of her tresses down in a poker straight edgy style.
Nicole was the epitome of laidback elegance at the One for the Boys Fashion Ball by wearing her smooth locks down in a dramatic side parting.
The singer was the epitome of elegance with this chic voluminous blow-dry hairstyle.
Nicole could have stepped out of old Hollywood when she stepped out with these retro-esque flawless curls.
The X Factor judge had us reaching for the straighteners with this glossy, poker straight look.
The singer majorly upped the beauty stakes when she rocked this sideswept curly hairdo as she attended the launch of Cats.
The Don't Hold Your Breath hitmaker looked effortlessly cool with this slightly undone top knot paired with tumbling tousled waves.
Nicole showed off her beauty credentials with smooth and slicked back hairstyle – take note from the star and pair with a statement red lip for ultimate wow factor.
Nicole mastered daytime glamour with this large, slightly undone bun, giving us major hair inspiration in the process.
If you're thinking of going for an ombré colour, take a leaf out of Nicole's book and opt for sleek layers to show off the varying shades.