The younger sister of Kate Middleton/The Dutchess of Cambridge. She was the maid of honour at the wedding of Prince William and her sister in April 2011. She is ridiculously plain looking, but many men drool over her and think she is the hotter sister.

She probably shagged Prince Harry on the night of the royal wedding.
Kate middleton is hot....no, hold up...check out her hot younger sister Pippa Middleton! I bet Prince harry will tap that tonight.
by kiwininja May 1, 2011
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To be intentionally upstaged on your wedding day by your more attractive, sluttier sister
Stop weeping child, Mummy is here. I know it is frightfully unfair to be usurped by anyone on your own very special day! The fact of the matter is that you've just been Pippa Middletoned by your slag of a sister.
by PokerBroker9 May 6, 2011
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