Pippa Middleton showed some skin in a plunging red dress on Saturday night for the Boodles Boxing Ball at London's Park Plaza Westminster Bridge Hotel. She was joined by many other members and friends of the royal family. Princesses Beatrice and Eugenie also dressed up for the occasion, as did Prince Harry's ex Chelsy Davy. Pippa and Kate's younger brother James threw on a tux much like aristocrat Henry Beckwith, who brought his apparently on-again girlfriend Geri Halliwell. The Boxing Ball is a big annual charity event in the UK, and Prince William attended three years ago with then-girlfriend Kate. It was underwritten by the jewelry company Boodles and proceeds went to benefit the Starlight Children’s Foundation and the Lieutenant Dougie Dalzell Memorial Trust. Pippa and boyfriend Alex Loudon met up once inside, and were seen sharing a passionate kiss after the bash as they waited for their car at around 4:30 a.m.