Blake Lively Gets Crazy Competitive While Playing "Know It All" With Jimmy Fallon

Jimmy Fallon was joined by the ever-gorgeous Blake Lively on The Tonight Show on Monday night and challenged the actress to a fun round of "Know It All" — a game of knowledge and deception to see who can name more things in different categories. After Blake selected the Harry Potter characters category, it wasn't long before she showed off her competitive side, yelling at Jimmy, "Come on, do better ones!" Things then took a hilarious turn when Jimmy chose the Spanish words category and Blake completely blanked out. To find out who wins, watch the clip above, then check out Blake's stunning outing in NYC earlier in the day.