The "Downton Abbey" actress, 27, feels Knightley has an impressive face structure, reported People magazine.
"She has such a strong structure for her face. I can't stop looking at her face!," James said.
The actress also admitted to being big fan of lipsticks.
"In my normal handbags, I usually have quite a few lipsticks. They sort of mound up. My Chapsticks are regular, and my go-to lipsticks are the Burberry Kisses lipsticks, which I truly love. I'm really into that nude tone that's quite mellow and effortless," she said.