If you've wanted to own that dress ever since the Royal Wedding ... you're in luck!

The stunning Sarah Burton for Alexander McQueen replica gown is now available through the U.K. luxury online retailer Net-a-Porter. The dress is exactly like Pippa's ... except it zips up the back instead of buttoning up.

Fans of the dress can snatch the gown up for a cool $3,100 -- but not in a size zero ... it's currently sold out.

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