Pippa Middleton arrived at Westminster Abbey wearing a custom ivory gown by Sarah Burton at Alexander McQueen this morning. The crepe cowl front dress had the same button detail and lace trim as the bride's gorgeous McQueen wedding gown. Pippa wore floral diamond earrings and a coordinating headpiece that were made for her by the same jeweler, Robinson Pelham, who designed Kate's earrings. She tended to the young bridesmaids before assisting Kate with her 9-foot train as she entered the church. Pippa held Kate's bouquet during the ceremony and helped the new princess exit the abbey and enter a private area to sign the register before the bride and groom reemerged to walk down the aisle as a married couple.