We usually think of bunnies as docile creatures, but there appears to be a pointy-eared showdown going down at Hugh Hefner's Playboy Mansion, where Hef's original Girls Next Door are being phased out for younger, more arrest-prone replacements. Though Hefner insists the split is amicable, founding bunny Kendra Wilkinson (perhaps emboldened by her recent hate-on for Tom Brady) has a different take on the matter, and she seethed on the record to E!.In a video interview conducted at the mansion's Halloween party (and out of sight from her publicist), a visibly tense Wilkinson interrupted one of the reporter's questions to state, "There will only be the original Girls Next Door. We built this show, and we worked our butts off to be here." Then, gritting her teeth, she added, "These girls are coming here afterwards, which I have no problem with, [but] we've made this for them. I would appreciate it if they would be a little more thankful." When pressed further, though, a suddenly circumspect Wilkinson froze and said, "I don't know if I can open my mouth anymore... Shh. It's a secret!" What girl-on-girl rivalries might be existing behind the scenes at the Playboy Mansion? And, most pressingly, do they involve pillow fights? Developing!