Princes William and Harry have grown up in the spotlight, sharing more than a few sweet moments in front of the cameras over the years. From their early days standing on the Buckingham Palace balcony with the rest of the royal family to their later appearances with Kate Middleton, they regularly crack up together, sometimes exchanging funny glances during official events. Who could forget the time they channeled Harry Potter? Or the time Harry gave Will an adorable look in the middle of the royal wedding? In honor of Prince William's 34th birthday on Tuesday, keep reading for Prince William and Prince Harry's best moments together, then see Harry's best facial expressions.