Pippa Middleton used a pair of designer silk knickers to enhance her famous bottom at the 2011 wedding of her sister, Duchess Catherine, to Prince William.
The £80 knickers were bought from Beautiful Bottoms London to go under the Alexander McQueen bridesmaid dress she wore to her sibling's nuptials, according to Grazia Daily.
The lingerie label - founded in 2009 - was said to be "thrilled" by Pippa's choice of under garment.
Pippa has carved out a new career in the spotlight since her pert bottom made its debut at Duchess Catherine - formerly known as Kate Middleton - and Prince William's wedding, but she previously admitted she found it daunting how quickly she rose to fame.
She wrote last year: "It is a bit startling to achieve global recognition before the age of 30 on account of your sister, your brother-in-law and your bottom.
"One day I might be able to make sense of this. In the meantime it's fair to say that it has its upside and its down side."
The brunette beauty has since released a party planning book named Celebrate and now regularly writes for Vanity Fair magazine and Waitrose magazine.