In a gritty contest, marred by an early first-half injury to Palace top scorer Jean-Philippe Mateta, the Eagles showed plenty of fighting spirit to come out on top and reach the last eight of the famous Cup competition.
An own-goal from Japhet Tanganga set them on their way, with Daniel Muñoz and Eddie Nketiah's efforts, either side of a brief Millwall reply, sealing the victory.
Now, it's time to choose your Player of the Match from the big win!