Cara Delevingne stopped by "The Tonight Show with Jimmy Fallon" last night to talk about her upcoming movies "Paper Towns" and "Suicide Squad" — and to give house band The Roots a run for their money. Fortunately Fallon just happened to have a live microphone waiting, because it turns out Delevingne can drop a pretty sick beat. She even slowed it down so Tariq Trotter could jump in with some freestyle. And she did it all while wearing high-waisted, wide-legged pants by Balmain covered in so many crystals Fallon remarked they must weigh more than him.