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Jessica Simpson, who has suffered with acne since her teens, officially endorses the hugely popular benzoyl peroxide-based range ProActiv. Find it online at proactiv.ie.

Trinny Woodall suffered with acne from the ages of 13-29. She swears by the Jan Marini range, in particular the Bioglycolic Lotion.

Cameron Diaz found that giving up smoking ended her decade-long battle with acne. "I tried everything -- facials, products, medication -- but my skin didn't change significantly until I stopped smoking two years ago. And the further away I get from cigarettes, the better my skin keeps getting."

Pregnancy calms down Victoria Beckham's acne-prone skin. "The hormones really suit her and she's said this pregnancy has cleared up her spots," said a source, about her fourth pregnancy.