Mariah Carey's husband Nick Cannon has warned celebrity jewellers to be more vigilant of imposters after a thief managed to con Los Angeles store staff into handing over gems by posing as his assistant. The unidentified suspect reportedly called the Santa Monica, California branch of top brand Fred Segal last week (ends17Nov13) and told clerks his boss needed some jewellery immediately. A woman at the store agreed to take the items to the Roosevelt Hotel, where another man, claiming to be a security guard, promised to take the pricey items up to the stars' suite and come back with the cash. The man never returned. Now Cannon has spoken out about the incident, insisting he's no stranger to imposters attempting to cash in by using his name. He tells TMZ.com, "That's crazy man... but a lot crazier stuff has happened. I mean, people have stolen my identity before, people have charged like, over $200,000 to my Amex (American Express credit card), all types of stuff... That's part of the sacrifices we make as celebrities and being in the public eye that somebody can just grab your name, go online, do whatever they want to do, say they're part of your crew. "But I pray for those tortured souls, real talk, if somebody gotta do that, that's a dirty thing." And Cannon insists he would always handle requests personally so jewellers and other business owners know who they are dealing with: "If I want some jewellery from you, I'mma (sic) call you directly!"