Kate Middleton showed off her form — her volleyball form, that is — today at her first official solo event since giving birth in July. Kate sported skinny jeans, high wedges, and a familiar blue-and-white striped shirt to help support young athletes at London's Olympic Park for the charity Sportaid. The Duchess of Cambridge was beaming as she greeted kids and took to the court for an impromptu volleyball game. She even gave the crowd a peek at her amazing abs as she reached for an overhead hit. This is a far more casual event than her next duties. Her son, Prince George, will have his official christening next week on Oct. 23. The royal family has been gushing over Prince George, and the world anxiously awaits getting another glimpse at the precious little one. We haven't seen George since his official portrait with William and Kate, so we're looking forward to seeing how much he has grown already!