The Jolie-Pitts spent this afternoon taking a tour of Venice by boat! The first matter of business, though, was getting some gelato for Zahara, Shiloh, Pax, and Maddox. The gang is in Italy after apparently spending their Valentine's Day in LA with Sean Penn, though the globe-trotting family of six never stays in one place too long. Brad and Angelina also treated us to our latest sighting of twins Knox and Vivienne! Click through to see their afternoon of playing tourists.