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. Madonna is one of the first celebs to jump into the Instagram video craze, and for her first post she's showing her fans that she can still "get into the grove." The 54-year-old pop icon, wearing workout gear and fingerless gloves, is seen dancing her little toned toosh off in the clip. Madge repeats the phrase "booty pop" as she does just that, and rounds out the video by declaring she is, "addicted to sweat." Instagram has no current plans to sell ads, but that isn't stopping analysts from salivating over the potential of video ads running on the platform and in News Feed.