The latest episode of "Pretty Little Liars" is exciting as it features Paige and Emily's drama, Aria going all mad about Ezra's truth and Spencer ready to go to rehab. Wait, she is not ready go, she is ready to fight back the habit on her own. Fans can watch "Pretty Little Liar" season 4, episode 21 online on ABC Family. Also, the episode will be made available on Amazon and iTunes.

Official ABC Family synopsis for "Pretty Little Liars" season 4, episode 21, "She's Come Undone"

"Emily, Hanna and Spencer are concerned for Aria as they watch their friend crumble after learning shocking news about Ezra. Not knowing what is true or what to trust, Aria goes looking for answers, not wanting to believe this revelation to be true. While concerned for Aria, Spencer is not doing so well herself. Trying to prove to her parents and Toby that she can kick the habit on her own, Spencer has to be careful because one misstep could send her to rehab. But can Spencer really rein it in, or will her constant curiosity and drive be her undoing?

Meanwhile, Paige has had enough with Emily's secrets and is determined to stop it."

Aria is one who is coming undone in this instalment of "Pretty Little Liars" season 4. She is freaking out and desperately looking for answers from none other than man himself - Ezra. In one of the sneak peeks, she is walking in the hallway of Rosewood as she wants answers. Spencer and Emily try to stop her from confronting Ezra in school. However, she is not at all in a mood to listen anyone but Ezra. She walks into her class and asks, "Where's Ezra?"

The substitute informs that "Mr. Fitz" is taking time off to address a family emergency. At this point, Aria has that "yeah right" expression on her face.

Meanwhile, Spencer's parents want their daughter to go to the rehab to deal with drug addiction problem. However, she begs that she wants one chance to fight the habit on her own. She is a determined girl and can do what it takes.

"Pretty Little Liars" season 4 episodes air Tuesdays on ABC Family.