As it turns out - it's the same one thing... What are the odds?!

Speaking with Ellen on her show yesterday, the 43-year-old actress said (around the 2 minute mark): "Someone asked me, 'What’s your favorite thing about being married?' And I was like, 'Well, I just learned so much about myself. I didn’t know these things.' And I was like, 'I would have never known them if I didn’t meet my husband, who helped me.'"  

When she was then asked what the worst thing about being married is, Diaz said: "I learned all these things about myself that I wish I never learned about myself and I wouldn’t have known them if I didn’t get married! So it’s like this double-edged sword. But I’m just so grateful for it because I couldn’t do it without my husband and I couldn’t do it with anybody else except for him."

Cameron was on the show to promote her new book 'Longevity' - hence why she's so super enthused about marriage, and a load of other stuff that will help you live longer - meaningful "purpose for living' relationships (not just romantic ones) are key.