EXCLUSIVE

Andy Dick is in custody for allegedly running off with a guy's $1,000 necklace.

The troubled actor was riding his bike on Hollywood Blvd. last week when he spotted a guy with the chain. Andy rode up and asked if he could see it. The guy recognized Dick and said, "Sure." Andy then allegedly pulled a Dick move and rode off with the jewelry.

The owner reported it, but Andy was nowhere to be found.