Wiz Khalifa's mainstream penetration hit its pinnacle today, with the news that the Pittsburgh rapper is on the cover of this week's Rolling Stone. That's right, a mag known for its up-to-date John Mellencamp coverage is onboard the Wiz Khalifa train now. Don't break your leg hopping on the bandwagon, RS! Does anyone else find it hilarious that Rolling Stone feels itself qualified to call someone a "hip-hop's rookie of the year"? "He's the rookie of the year, because we've never heard of Yelawolf, Odd Future, Pill, Big K.R.I.T., or DaVinci."