The talented Mr Damon
Throughout their teenage years the pair was forever sneaking off to New York for auditions.
They broke through together, writing and starring in their 1997 big-screen hit Good Will Hunting and earning an Oscar in the process, for Best Screenplay. But then, like brothers, their lives took their separate courses: one tackled a number of high-budget, misfiring movies, and at least one high-profile romantic tryst, emerging as something of a tabloid darling, while the other adopted a lower profile, cutting his teeth as a support player before emerging as the more bankable actor.