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Duchess Catherine, Kate Middleton, Pippa Middleton

RADCLIFFE/bauergriffinonline.com

Talk about your two-for-one deals!

As it is, we're pretty obsessed with both Kate Middleton (aka Catherine, Duchess of Cambridge) and her younger sister, Pippa Middleton.

So you can only imagine our excitement when we saw the British gals come together for a morning stroll on Llanddwyn Island in Wales on Sunday.

The lovely ladies kept things way more casual than they did for Kate's wedding to Prince William in April, of course.

While the stylish siblings both opted for dark denim, 29-year-old Kate wore a pretty, pale-pink cowl-neck sweater that hugged her slim figure and green knee-high rainboots for the jaunt, while Pippa, 27, chose a preppy navy cardigan over a button-up shirt, sensible running shoes and aviator sunglasses.

There's nothing like a little sister-sister bonding time—carry on, you two!