Dianna Agron in Hiding to Escape from 'Loose Cannon' Ex 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.

Pettyfer's rep is saying that the actor made no threats.

It was revealed yesterday that a racy photo shoot was the likely cause of Pettyfer and Agron's breakup. Last year, Pettyfer stepped into a whole new world for a daring photo shoot with celebrity photographer Tyler Shields, but during the shoot, the 'I Am Number Four' actor got a little too close for comfort with models Lydia Hearst and Leven Rambin.