Justin Timberlake brought sexyback on Friday night with a special private performance gearing up for the weekend's big show--the 2013 Grammys.
Hollyscoop got special coverage of his performance with Timberland at the UN launch even for mPowering Action- a mobile app that allows youth from around the globe to connect through music.
And Justin wasn't the only treat of the night. Later in the night Estelle and Avicii also wowed the crowd. Check out the exclusive performance below...
