"Equals" shows Hoult, 25, and Stewart, 24, living in a futuristic world where all human emotion has been eradicated. The two play lovers in the film, reported E! Online.
"She's so talented. I really can't speak highly enough about her. She's a talented, lovely and a wonderful girl... She's just got such a smart approach to her work and she's a real artist," he said about Stewart.
"My character starts to get what they consider a sickness, where he starts to have nightmares and feel things and he's like, 'Hang on! What's going on here?'