We know Tom Brady’s back from Italy — where he was photographed in the buff — because the Pats QB was at the Seaport Hotel Tuesday to host a kickoff event for the Best Buddies Challenge: Hyannis Port, the 100-mile charity ride/walk that benefits Best Buddies International. (The nonprofit helps people with intellectual disabilities.) Next year’s Best Buddies Challenge will take place June 2 and 3. . . . Meanwhile, New Kids on the Block member Jordan Knight said hello to some exchange students from Novara, Italy, who paid a visit to Novara, the Italian restaurant in Milton that’s named after the Italian province and of which Knight is a part owner.