Prince William will be playing a key role at his younger brothers wedding next month. Harry asked his brother, The Duke of Cambridge to be his Best Man at his wedding to Ms. Meghan Markle. Kensington Palace announced that William is honored to have been asked and is looking forward to supporting his brother. Harry supported William as Best Man during his wedding Kate Middleton in 2011. Harry and Markle announced their engagement in November. William, now a dad of three joked about the news.