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After blending out the contour color, use an angled brush to place black eyeshadow on your lash line and extend it out to the corner a little bit. Kate Middleton does not create a cat-eye with her liner but does extend her darkest shadow out past the corner of her eye, so if you want to achieve her look, you should do the same. Blend out the black so that it is not stark and obvious. She uses either a gel or liquid liner, but since the appearance is similar just use whichever you are most comfortable with. I used a liquid liner because it was faster and lined my eye all the way around just as she does. She applies the black liner to the bottom lash line and not the waterline. This is the look she goes for, although it is not the most flattering because lining your eyes all the way around is a dated look and will make your eyes appear older than they are. Regardless, I did it to show you the exact way she goes about doing her makeup!
After this all you need is a coat of black mascara and use some darker eyeshadow or an eyebrow liner to fill in your brows. Kate has dark eyebrows and it appears as though she fills them in from close-up photos of her. My brows are much more arched than hers because hers have a more straight appearance, if you can get your brows to go in straighter then you will achieve a look much more similar to hers than I ever will. Make sure to fill in your brows with a darker color because it makes a big difference to the overall look. For your face, apply foundation in a natural color, then contour your cheeks as well as up and around your hairline and forehead with a bronzer. Kate has quite a tanned facial complexion when she applies her makeup so this leads me to believe she uses quite a lot of bronzer, and some light pink blush on the apples of her cheeks. She has quite a matte look to her face so I don't recommend using any shimmer powder or cheek highlights if you're going for her exact look.
She doesn't wear lipstick, just a coat of a nude lipgloss you think is attractive on you will work great. It's a pretty low-maintenance look that's easy to do in the morning if you want an appropriate work look (though I would skip out on the black liner all across the bottom lash line). Hope you have fun making yourself look like Kate Middleton!!! :)