MERCEDES Ruehl, the “Married to the Mob” actress who plays Vincent Chase’s mother on “Entourage,” had a traffic mishap in East Hampton on Friday. Ruehl, 61, made a left turn in front of a Yamaha motorcycle being driven by a local 24-year-old man, who plowed into the rear of her 2008 Subaru. The bleeding cyclist was taken to Southampton Hospital with an injured leg. Ruehl was given a ticket for failing to yield the right of way.