The Hollywood beauty was so shocked by how "real" the animation looked, she warned long-term partner Brad Pitt about the sexy nude scenes.
Angelina said: "I was really surprised that I felt exposed. There are certain moments where I actually felt shy - and called home, just to explain that the fun movie I had done that was a digital animation was, in fact, a little different than we expected.
"I didn't expect ourselves to come out as much. I didn't expect it to feel as real, so it was kind of funny at first."
Angelina, who was pregnant with her daughter Shiloh when she worked on 'Beowulf', admits her baby bump caused some problems for the animators.
She told People magazine: "I was three months pregnant for some of it. You wouldn't know though. We did the mapping of my body before and they worked wonders. It was a pleasure."
The film sees Angelina play a temptress killer lizard, painted gold and sporting a tail, and Angelina admits: "I really did love my tail."
'Beowulf', directed by Robert Zemeckis and starring British actor Ray Winston, is due to hit cinemas later this month.