Jennifer Lopez has allegedly increased security because an animal-rights activist has been sending her letters threatening "'to kill her in public, just like the slaughtered animals whose fur she wears."

The source says J.Lo initially dismissed the notes, which have been arriving for a month, as lunatic junk mail. But husband Marc Anthony isn't taking the matter lightly. "He has hired two off-duty police officers, in addition to her usual security team, to watch over Lopez whenever she makes public appearances," ...