The former Eastenders actress is travelling to Hollywood to work on the next American Pie film.
"I doubt I'd ever go off the rails," Now quotes her as saying. "I've got good friends and family around me to keep me grounded, and I think I'm past that now.
"I appreciate it all so much I wouldn't do anything to screw it all up."
Lytton added: "I don't think it was until I got there that it hit me... I had my own Winnebago and a lovely apartment to stay in. It was really surreal."