Words of advice for Crystal Harris: Try not to find yourself trapped alone with Kendra Wilkinson!

Showing her enduring fondness for Playboy chief Hugh Hefner, Kendra, 27, told a radio show that she wanted to kill Crystal when his now-wife previously dumped Hef.

“I got p****d off when she hurt him,” Kendra told the Big J radio show in Montana.

“Of course, someone like me, I wanted to kill her. So now he’s trying to get peopl