Who is Pippa Middleton?

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The world is counting down to see William, Kate, Pippa, Harry and more family members gather for the royal wedding -- wait! Who's Pippa?

That's Philippa Charlotte Middleton upon your first meeting, or you can call her Pip, that is, of course, if you're Kate Middleton. She may be Kate's little sister, but she's already made a name for herself as an English socialite and writer for her family's business.

Pippa may not currently have a royal title in her future, but the 27-year-old Edinburgh University graduate is no stranger to royalty. Though they don't come from a titled family, the Middleton sisters, who have been referred to as the "Wisteria sisters" in the English press (referring to their perceived social climbing), frequently flock with the elite. Pippa's friends include reportedly include George Percy, the son and heir of the Duke of Northumberland and Lord Edward Innes-Ker.

A Pippa night out could include a mix of the who's who of the royal family lines, with a dose of trendy night clubs and paparazzi. Pictures have surfaced of Middleton with Princess Beatrice and Princess Eugenie attending the Eyes Wide Shut Masquerade charity event in late February of 2011.

During the day, Pippa, who reportedly studied English in college, writes for The Party Times, the online magazine for her family's company, Party Pieces.

But what was possibly Pippa's biggest project yet wasn't work-related; she staged her sister's top-secret bachelorette party. According to People.com Pippa booked four venues in London, and kept details under wraps until the last minute -- even for the invited guests.