When: July 20, 2010 and September 30, 2010
What Happened?: First, Justin tweeted that he was in the studio with the legendary producer. Then a couple months of later, he got his own line of Just Beats headphones under the Beats by Dr. Dre line.
Complex Says: Dre hasn't had a hot beat in ages. Don't do it, kid! (Good call on the headphones, though.)