Lollapalooza 2011: 11 Things Seen & Heard Sunday
Skylar Grey and Karmin perform together backstage at Lolla at the Billboard Tent, August 7, 2011.

When you get this many musicians in one place, impromptu jam sessions are bound to happen! Earlier today (Aug. 7) at the backstage Billboard Lollapalooza lounge, viral stars Karmin -- the YouTube duo known for its fast-talking female rapper on "Super Bass" and "Look At Me Now" covers -- got a drop-in from one very special guest.

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Lollapalooza 2011 Main Page

Skylar Grey, guest vocalist on Dr. Dre and Eminem's "I Need a Doctor" (among other tracks), was nearby while Karmin's cover of the track was being recorded. So naturally, Skylar decided to give the take on "I Need A Doctor" an authentic addition. Watch below, as Skylar and Karmin rock the rap track on the fly. Only at Lolla!

LOLLAPALOOZA 2011
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