02/28/2011 10:06 am ET | Updated May 25, 2011

Chelsy Davy & Pippa Middleton Hit Harry Potter Castle Wedding (PHOTOS)

Text by the Associated Press

LONDON (AP) -- Was it a dress rehearsal for Kate Middleton's sister and Prince Harry's on-again, off-again girlfriend?

Pippa Middleton, 27, the princess-to-be's maid of honor, and Chelsy Davy were photographed at the swanky castle wedding for Lady Katie Percy and financier Patrick Valentine.

Prince William and his fiancee were thought to be on the guest list, but the couple didn't attend Saturday, disappointing a posse of photographers waiting outside.

Some of the royal couple's friends did attend -- including 3-year-old Grace van Cutsem, a godchild of William's who will be one of the bridesmaids for his April 29 wedding at Westminster Abbey.

Saturday's wedding reception was held at Alnwick Castle, better known as the setting for wizard school Hogwarts in the Harry Potter movies.

Take a look at what Pippa and Chelsy wore to the nuptials -- both gals topped off their looks with headpieces, of course.

***For more royal wedding news, visit our Royal Wedding Big News page.***