Who Is "A" on Pretty Little Liars? Meet Our Top 12 Suspects

Why It's Possible:

• Melissa admitted to dressing as one of the two Queens of Hearts.
• When Spencer confronts Melissa about her association with the "A" team, she admits to being involved.
• She has motive to want to hurt Alison, who had an affair with her now-dead husband, Ian.
• Ian was on the NAT club, and Melissa was definitely tangled in that web too.
• Like we said above, if anyone in Rosewood has the smarts to pull this off, it would certainly be a Hastings.

Why It's Not Possible:

• Melissa Hastings has been in London for an internship.
• Melissa might really have gotten into this whole mess to protect Spencer.
• It's too obvious! Melissa has done a lot of shady stuff throughout the show's run, and she's been a pretty constant suspect.