Jessica Alba in tartan trousers

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Kristen Stewart in tartan trousers

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Kate Middleton proved that tartan will be this season's print de jour when she stepped out at her old prep school, St Andrew's, donning a plaid Alexander McQueen dress and it didn't take long for a hoard of celebs to follow suit.

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We can always rely on Kristen Stewart and Jessica Alba to give us wearable style inspiration, and they've both been spotted styling up tartan trews.

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While K-Stew trailed the trend in Juicy Couture cigarette pants, Jessica favours a more casual approach as she stepped out earlier this week in Current/Elliot's checked denims. The celebrity fashion trend has also travelled across the pond, as Brit fashionista Anna Friel was seen exiting the Vaudeville Theatre in a pair of tailored plaid skinnies.

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Cue a hot new trouser trend!

WATCH KRISTEN STEWART'S 10 BEST FASHION LOOKS BELOW