Angelina Jolie's Maleficent co-star Sam Riley has confessed he felt like he ought to bow every time he saw her on set.

The British actor - whose new film On The Road with Kristen Stewart is released in October - has been working with Angelina in Disney's fairytale spin-off movie about the Sleeping Beauty sorceress.

Sam said of working with Angelina: "She's approachable but she has an aura of a star, certainly, you want to bow when she comes on set. I do in my character."

The Control star added: "She's very nice, I know everyone says that about their colleagues but she's very cool."

The 3D film, which has been written by Linda Woolverton and is scheduled for release in 2014, reveals the events that hardened Maleficent's heart and drove her to curse the baby, Aurora (Elle).

Angelina previously revealed that her children are excited about her transformation.

"I'm having a lot of fun. I've already got my horns fitted. My kids are very happy," she said.