Credit: Jeffrey Mayer/

Beastly behavior, indeed!

A source tells the new issue of Us Weekly (on stands now) that actor Alex Pettyfer, 20 -- who flew into a jealous rage at a West Hollywood club February 18 over ex Dianna Agron -- has become persona non grata in the motion-picture biz.

"His agents told him not to go to the February 26 Night Before party," a source says of the event, which Agron, 24, attended.

Just two days earlier, Pettyfer nearly missed the premiere of Beastly after his Beverly Hills home caught fire; the blaze was put out in under 24 minutes.

The insider adds Pettyfer's agents may fire him, since his volatile actions "have become a liability."

For now at least, a William Morris rep tells Us that the British I Am Number Four star "is still a client."