Steinfeld proves purple is certainly one of her best colors as she looks extravagant in her new partnership with Nexxus Hair.

"Purple shampoo neutralises the yellow in blonde hair, leaving a creamy to ash result ... With over 10 years of experience on women's luxury lifestyle titles, she covers everything from the ...

What you really need? A purple shampoo. Yep, unlike darker brown hair colours, blonde hair has an annoying tendency to fade and become brassy. Thankfully a toning purple shampoo can help prevent this.