Watch Pretty Little Liars - That Girl is Poison

Pretty Little Liars Season 3 Episode 5

Season 3 Episode 5

First Aired: July 10, 2012

Description: Aria, Emily, Hanna and Spencer go undercover at Jenna's over the top birthday party to figure out if "A" is behind all of it. But their plan goes awry and it seems nothing is turning out as they hoped.