This Might Be Kristen Stewart's Most Animated (and Adorable) Interview Ever

Leave it to Jimmy Fallon to get Kristen Stewart to open up about her many facial expressions. During Kristen's stop by The Tonight Show on Tuesday, the actress joked about how she actually does smile a lot. As for why the cover woman is often striking superserious yet sexy poses in magazines, including the August issue of Marie Claire, Kristen suggests she's just going with the flow. Watch her hilarious chat with Jimmy in the video, above, and don't miss all the fun they had while playing "Word Blurt."