The star is set to play the Caped Crusader in "The Batman" and, although production on the movie is yet to begin, Robert already knows what his version of the iconic DC Comics character will sound like.
"Willem's voice in this was quite inspiring for it, to be honest," he told Access Hollywood while promoting the pair's latest flick. "It is pretty similar, the voice I'm gonna do, to Willem's."
Adding a pirate's "Aaargh!" as he joked about Willem's gritty voice, the Twilight star added: "I think Batman has a sort of pirate-y kind of voice - I think that will really suit it."