Pippa Middleton has caused quite a stir.

The sister of Kate Middleton, Duchess of Cambridge and wife of Prince William, has become an international sensation ever since appearing at her sister's wedding wearing a curve-hugging, buttercream Sara Burton of Alexander McQueen gown.

She was instantly dubbed Her Royal Hotness on blogs around the world.

Most of them were referring to her extraordinary bottom. But we think Pippa's style is just as gorgeous.

Pippa Middleton has that quintessential girl-next-door look. She has an athletic build and she opts for more natural make-up choices.

Middleton's style could best be described as casual chic.

Some of her style staples include: ballet flats, sunglasses, sheath dresses, blazers, and brown boots.

She usually sticks to primary colors -- black, red, brown, navy, and white -- and steers clear of wild prints and neons.

Pippa has gotten acclaim for her fashion sense and beauty in countries around the world.

Actress Sarah Michelle Gellar even went so far as to compare Pippa to Kate. In reference to Kate's rail thin physique, Gellar said to Health magazine: I feel like 10 years ago, it would have been like, 'Oh, she looks incredible.' Whereas you look at her sister, who has such a fabulously athletic body­ -- I mean, a real athlete's body -- and I think there's this movement now, where more women, finally, want to look like that.

The 28-year-old is a party planner in the UK, working for her mother's company Party Pieces.

She is currently dating Alex Loudon, a former cricketer and now business student at the London Business School.

Although they keep their relationship hush-hush, a source reportedly told Marie Claire, He is madly in love with her. Alex thinks it's hilarious that suddenly the world has discovered Pippa.

Check out the following slideshow of some of Pippa's chic ensembles.

*All images were retrieved from the Tumblr page made by Pippa Middleton fans.

*All clothing specifications retrieved from the Pippa Middleton website set up by Pippa Middleton fans to showcase her latest styles and finding the originating store.

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Pippa Middleton
Pippa adds a bit of edge to her brown and black ensemble with an oversized studded tote. When Pippa was first photographed with this bag, women around the world clamoured for it. The bag is by Tabitha and is called the "Tabitha Studded Stardust Bag." It flew off the shelves the second it hit the market. Tumblr
Pippa Middleton
Pippa Middleton has been seen many times walking around London in these over-the-knee, camel suede boots. They are both sexy and casual. Her long black Zara coat and scarf make the look complete. She tops it all off with some Ray Ban aviators. Tumblr
Pippa Middleton
Pippa looks stunning in this scarlet red gown with plunging neckline. She will opt for a pop of red every now and then, amongst her typical shades of black, camel, and white. Red is a beautiful color on brunettes like Pippa. Plus, her figures makes this dress look out of this world. This dress is a Temperley London called 'Begonia" and can be bought at Topshop. Tumblr
Pippa Middleton
Pippa adopts a casual-chic look in this autumn outfit. Over the summer, she was often seen pounding the pavements of London in her flats. Tumblr
Pippa Middleton
Another splash of red in Pippa's attire. Red was one of the hottest colors for the autumn 2011 season and Pippa knew how to work it. This coat is another one from Zara. She pairs it perfectly with her over-the-knee camel boots and a leopard printed scarf by Alice by Temperley. Tumblr
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This is one of Pippa's more dramatic looks - silken material, long sleeves, floor length, and floral print. She tones it down with natural make up and pulled-back hair. The dress is the "Elle Botanical Maxi Dress" by Project D. Tumblr
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