Premiership glory awaits!
But it was Neil Harris who stole all the headlines as he finally beat Teddy Sheringham's all-time goalscoring record for the club with his 112th strike.
Luke Murphy had given the home side the lead after just seven minutes when he fired into the top corner but just sixty seconds later Crewe keeper Steve Collis fumbled Scott Baron's cross into his own net.
Harris then struck to give Millwall the lead - and to secure his place in history - only for Shaun Miller to scramble home an equaliser minutes later. But with extra-time approaching Whitbread headed home the winner to send The Lions through.