Cameron Diaz

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Cameron Diaz is just getting better with time.

The stunning Bad Teacher star turns the big 4-0 today, and while we're not sure how she'll celebrate her birthday just yet, Diaz definitely has several reasons to throw one major party. 

In the year leading up to her 40th birthday, the leggy blonde became the new face of Tag Heuer Watches, looked über-hot on the cover of U.K. Harper's Bazaar and landed on Forbes' list as one of Hollywood's highest paid actresses. 

And that wasn't all.

After dazzling at the premiere of her flick What to Expect When You're Expecting, Diaz began writing a book for young girls about the importance of proper nutrition and staying healthy—a project that was semi-inspired by her new BFF Gwyneth Paltrow.

With a few movies (and more projects) already in the works, we can't wait to see what else is in store for this ageless beauty.

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