Bieber fever has taken over New York City.
Justin Bieber performed a mini-concert for NBC's Today Show summer concert series, and screaming teenage girls took over New York's Midtown area.
Over 8,000 "Beliebers" piled into Rockefeller Plaza and the adjacent blocks surrounding the venue.
Some of Justin's fans have been camped out at Rockefeller Plaza since Tuesday morning, hoping to get a glimpse of the "Right Here" singer.
Justin performed a few of his new hits off his Believe album, but made sure he returned to his faithful oldie, but goodie "Baby."
Justin even surprised his "Beliebers" with a special guest appearanec by G.O.O.D. music rapper Big Sean.
Check out Bieber's other performances in the videos below!
Justin Bieber performs "Boyfriend"
Justin Bieber & Big Sean Performs "All Around The World"
Justin Bieber brings out Big Sean to perform "As Long As You Love Me"