PIC: See Pippa Middleton's Stunning Evening Gown
It was Kate Middleton's big day, but her baby sis almost showed her up.
Wearing a emerald green dress, Pippa, 27, arrived at Buckingham Palace Friday night for a wedding reception thrown by Prince Charles in honor of Prince William and Kate's wedding earlier that day.
At the lavish party, 300 lucky guests -- including Middleton's parents -- enjoyed dinner and dancing.
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