"In recent years, I've had really bad attacks where I totally froze up. I thought, 'Well, if I am going to get stage fright, then I am packing it in.'" 

Grant, who has scored big with hits like Love Actually, Bridget Jones and Notting Hill, says filming romantic comedies make him particularly nervous.

"I like everything about filming except the acting. I'm wonderful in rehearsals, but I have never been very good when they actually switch the cameras on." 

Who knew?