Prince George, Princess Charlotte and Prince Louis stepped out Monday for their first official public appearance of the year.

Prince Louis's cheeky antics have brightened up many a royal event over the past few years, and he was back at it again to mark the 80th anniversary of VE Day on Monday, May 5. Prince William and Kate Middleton's youngest child joined siblings Prince George and Princess Charlotte at a military parade and flypast at Buckingham Palace—and Louis couldn't help himself when big brother George started fixing his hair during the event.