Robert Pattinson has a problem. He can’t remember his lines.

“When we do Twilight there is always someone there who takes care of everything and feeds you your lines. I read a lot on set, but as soon as I shut the book I can barely remember the last line I’ve just read,” the Remember Me star admitted.

Robert says his memory problem has been highlighted on the project he is currently filming with Uma Thurman and Christina Ricci.

“We’re just shooting Bel Ami and Declan Donnellan is directing it. He usually does stage productions and expects me to know all of my lines - like a stage actor,” he told Germany’s Focus magazine. “No chance! I realized how rusty and slow my brain has become.”

In the period film, Robert has several “disturbing” moments with Thurman. “The sex scenes with Uma are disturbing. Her character uses sex as a weapon and my character thinks like an animal,” Pattinson previously stated.

Bel Ami has a preliminary release date of 2011.