The star admits he is often approached by fans who have spent a fortune buying memorabilia online at auction sites and he fears many of them have been conned into purchasing things that aren't as authentic as they think they are.
He says, "People are paying a fortune for my shirts. It's a big rip off... The way to know if it's one of mine is if it says Squeak inside on the label.
"This little girl in Manhattan Beach (California) made them, named Squeak."
And Selleck reveals fans aren't only getting ripped off when they buy his shirts: "Everybody comes up to me and says, 'Hey, at auction I just spent $150,000 and I bought your car from the show'. I said, 'There's about 50 people who have told me that and there's only six cars."