The video is amazing; could these new BFF’s be any cuter?! Justin was performing a sold-out concert at the Barclay’s center in Brooklyn, New York as part of his 20/20 World Tour, when he welcomed surprise guest Jay Z to the stage for “Holy Grail.” Justin posted this picture of him and Jay Z (the “King of Brooklyn”) later in the night: Another fan posted this video of Taylor Swift and Beyonce in the audience: So, are Beyoncé and Taylor the best pop power BFF couple or what?