Joni Mitchell in Saint Laurent campaign

Joni Mitchell for Saint Laurent

Does fashion need models anymore? We only ask because two of the world's most iconic brands have looked to older women of cultural significance, rather than professonial models, for their new ad campaigns.

First, the 80-year-old American author Joan Didion was named as the face of Celine, and now legendary singer Joni Mitchell appears in the spring summer 2015 campaign for Saint Laurent.

The black and white images, shot by the label's creative director Hedi Slimane in Joni's very own home in California, show the songstress wearing an embroidered tunic, a fedora and a leather cape (which was made just for her, natch).

Who better to embody the 1970s feel of Saint Lauren't new collection than one of the queens of the 70s folk scene? No-one, that's who.

This isn't the face time the French fashion house has enlisted the help of a musician to model its wares. Recently, Marianne Faithful held that job, as have Kim Gordon and Courtney Love.

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Because, frankly, why bother getting an imitation when you can get the real thing?