Wow, with this outfit, Duchess Kate was definitely the centre of attention at her latest appointment.

On Tuesday, she was invited to the Forward Trust organization, where she gave the opening speech at an event on the topic of addiction. There, Kate showed up in an impressive red ensemble.

Duchess Kate shows her XS waist as the Lady in Red

Duchess Kate's Ralph Lauren turtleneck sweater was in the same tone as her pleated skirt by Christopher Kane. She also wore a colour-coordinated brown bag and brown pumps.

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Duchess Kate impressed in a red outfit at her new appointment.

The Duchess of Cambridge's outfit, certainly among her most beautiful ever, has an autumn feel to it, and it once again emphasized the slim figure and slender waist of Prince William's wife.

But there's more. Was Kate possibly inspired by another royal on this choice of outfit? What about Queen Letizia of Spain?

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Queen Letizia wore a similar red ensemble last month before Kate.

The Spanish royal often appears in red and has a love of pleated dresses and skirts. Lately, the two stylish royals seem to have been looking for inspiration in each other. With this appearance, Kate proves that Queen Letizia is not the only royal lady in red.

You can also click here to see the red carpet photos of Kate's appearance at the her husband's environmental awards show this weekend.