The title of America's favorite canine may be split between First Pup Bo  and Hollywood It dog Uggie , but in the UK, it's all about Lupo! Though both Windsor boys were the guests of honor  at a charity polo match on Sunday, Kate Middleton and Prince William's adorable Cocker Spaniel was overwhelmingly the center of attention (even among his royal entourage). We can't wait to see more of this cute pup and his princely antics . . . he's definitely our cup of tea!