Paris Hilton is "completely heartbroken" by Presley Gerber's death.
The 27-year-old model - son of supermodel Cindy Crawford and businessman Rande Gerber - passed away at a rehab facility after a long battle with addiction issues and now Paris, 45, has opened up about their friendship - calling Presley a "beautiful soul" and admitting she will miss him "more than words can say".