New York, Apr 28 (ANI): Pippa Middleton, the younger sister and the maid of honor of Kate Middleton, has reportedly scared palace officials with her attempts to introduce a 'younger atmosphere' to the royal couple's evening reception.The prince insisted that he wanted the 300-person evening event of the couple's friends to be very different from the formal champagne and canape reception being thrown by Queen Elizabeth immediately after the wedding.It's possible that Middleton's gown could come from the designer as well - she wore a black and white dress by the designer back in December for her first official engagement with Prince William.