Katy Perry Has a New Enemy?

What has become of Katy Perry? Why is she holding a knife?

The 'I Kissed a Girl' singer has this terrorizing photo, a promotional shot for her album "One Of The Boys, in which she is brandishing a knife. Having this photo released, alarmed anti-knife activists.

"This woman's behavior is unacceptable. She must be out of her mind to pose for a picture like this," Richard Taylor, a father of a stab victim, says. "Any youngsters seeing her will think it is OK to carry a blade," he adds.

The singer has been quite drawing attention and criticism in the industry, from the bisexual themes in her song "I Kissed A Girl" to the slapsticks in the recent MTV's Latin American Music Awards and now this photo. Are all this an enjoyment for her?