The "Theory of Everything" star is fronting the Italian brand's fall collection and a series of pictures featuring the British star modelling the label's latest trends, taken by photographer Craig MCDean, was shared on Prada's official Instagram account.
It isn't the first Redmayne, 34, has modelled for a major fashion house - he has also worked for British brand Burberry in 2008, before becoming a full-time actor.
Since hitting the big time, the actor has made it onto almost every best dressed male list there is, and was voted number one in GQ's best dressed British men poll for the second consecutive year last month.