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Dianna Agron Is "Terrified" of "Psycho" Ex Alex Pettyfer

USMagazine, Tuesday, February 22, 2011, 12:57pm (PST)

Glee's Dianna Agron didn't exactly sing a wistful ballad following her split from actor Alex Pettyfer after nearly a year together.

PHOTOS: Biggest Hollywood splits

Since moving out of the L.A. home she and the I Am Number Four star shared about two weeks ago, Agron, 24, "is staying at a hotel under an alias" a source reveals in the new Us Weekly, out Wednesday.

Why the secrecy? Pettyfer, 20, has been "a psycho loose cannon" in the aftermath of the split, another insider says.

PHOTOS: Love lives of Glee's stars

On Feb. 18, according to an eyewitness, he got into a heated confrontation at a West Hollywood club with actor Sebastian Stan -- furiously accusing the Black Swan star of hooking up with Agron.

"Dianna is terrified of [Alex]," a pal explains, adding that he "absolutely lost it" and threatened Agron during a vicious phone chat. (Pettyfer's rep tells Us he made no threats.)

PHOTOS: See what Dianna and other Glee stars really looked like in high school

To read much more about the ugly breakup, pick up the new Us Weekly, out Wednesday.

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