The Diamonds World Tour touched down in Amsterdam this weekend, with?Rihanna scheduled to play two shows at the Ziggo Dome. Naturally, upon arriving, the 25-year-old singer celebrated with a treat the city is famous for. On Saturday, RiRi posted several photos on Instagram documenting her cloudy adventures with one of her BFFs Jennifer Rosales. The observation about the thicket of British talent in the American media landscape is hardly new, but something is at work here. Justin Bieber's neighbors are being urged to call the cops on the singer and his lil buddies ... TMZ has learned.The Home Owner's Association in Bieber's Calabasas hood fired off a letter to its residents ... addressing a certain unnamed "celebrity" neighbor who has been wreaking havoc on their streets.