Blue-chip stocks are well-known not only for their strong track records but also for their consistent dividend payments.These dividends form a valuable stream of passive income that can support your retirement or serve as an additional source of income to supplement your earned income.The good news is that several blue-chip companies have gone beyond declaring core dividends.Some of them have also announced either a special dividend or an additional dividend as icing on the cake.Here are four blue-chip stoc ...