He has had roles in Taken 2 and Clint Eastwood's American Sniper, where the veteran director taught this young blood the value of stillness in a scene, but it is in the first Fifty Shades movie that he has made real impact - and he will appear in the sequel, too, which is now filming.
Surprisingly, however, for a young gun with big ambitions, Grimes turned down the lead role of Christian Grey.
"It just wasn't for me and I knew that," Grimes has said. "I wouldn't want to get myself in a position where I'm bumming people out because I'm not performing the way they want me to." He thinks Jamie Dornan is the perfect guy for the job and confesses: "He's a braver man than I."