The 'Fright Night' actor was given the leather accessory by his former soccer player father, Eamonn Farrell, but it is thought to have been stolen a few weeks ago and Colin is desperate to get it back.
A source close to the superstitious star – who is thought to have spent almost £3,000 repairing it over the years – told The Sun newspaper: "Colin has had this lucky leather belt for so long he just can't bear to get rid of it. The thing is literally coming apart at the seams.
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"The belt has undergone numerous alterations, like having extra holes punched into it and extra leather added since he has gone through so many weight changes."
Colin is very proud of his father and his successful sporting career.
He has previously said: "Geez, I wish I'd have a f****** penny for every time I said to someone in a bar, 'My dad is Eamonn Farrell and he used to play for Shamrock Rovers.'
"I have a big scrapbook of newspaper clippings and his jersey with three shamrocks on the back in mothballs."