Dianna Agron and Alex Pettyfer'Glee' star Dianna Agron is reportedly in hiding from her ex-boyfriend, 'I Am Number Four' star Alex Pettyfer.

UsMagazine.com is quoting a source saying that since Agron split from Pettyfer two weeks ago, she has been "staying at a hotel under an alias."

The reason for the secrecy is that since the split, Pettyfer has reportedly become "a psycho loose cannon."

An eyewitness is quoted saying that last week Pettyfer got into a heated argument with actor Sebastian Stan at a night club. Pettyfer went on to accuse Stan of allegedly hooking up with Agron.

A friend of the actress claims, "Dianna is terrified of [Alex]." The friend also said that Pettyfer has "absolutely lost it" and even threatened Agron over the phone.