Cameron Diaz: Working on a Fitness Book!

Cameron Diaz is all smiles as she picks up her car from the valet on Wednesday (August 8) in West Hollywood, Calif.

The 39-year-old actress met up with a pal for dinner at Mercato Di Vetro.

PHOTOS: Check out the latest pics of Cameron Diaz

Cameron has reportedly signed an agreement with HarperCollins for a book deal, which would focus on health and wellness, according to the Associated Press.

The book will offer advice to young women about health, fitness, nutrition and general well-being – it is currently untitled and scheduled for publication in the fall of 2013.

FYI: Cameron is carrying a Reed Krakoff gym bag.

10+ pictures inside of Cameron Diaz leaving Mercato Di Vetro…