Kate and Pippa Middleton both dazzle in red - but who's the Dress Queen?
Pippa, 28, led the way in her low-cut Temperley gown at the Boodles Boxing Ball earlier this month, completing her look with a pair of metallic shoes and matching clutch.
And the Duchess of Cambridge must have liked what she saw.
Last week, Kate chose a plunging long-sleeved Beulah gown of the same hue for the 100 Women In Hedge Funds charity ball at St James's Palace.
The 29-year-old, who attended the event with husband Prince William, 29, also carried a metallic clutch like her sister.
Other celebrities to choose this season's favourite colour include Beyoncé, Geri Halliwell and Kate Winslet.