Mariah Carey in PreciousMariah forgoes precious makeup for 'Precious' role ...

Mariah Carey has ditched her beauty products and gone au naturel for her role in the Sundance -- and now Cannes -- hit 'Precious: Based on the Novel 'Push' by Sapphire', and it may be the best move she's ever made.

The usually glam singer-actress -- who is said to travel with her own personal brigade of beauticians and sleep with no less than 20 humidifiers surrounding her bed -- is earning critical raves for her turn as a homely (to be nice) social worker in the film, which had its red-carpet premiere at the Cannes Film Festival over the weekend.

Check out some before-and-after photos, as well as the trailer, after the jump.

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