Cameron Diaz blouse shirt white bra black necklace turquoise bracelet gold gauntlet jeans ring

Cameron Diaz walked in to dinner with a boyfriend but walked out solo!

The Bad Teacher star had a romantic meal Saturday night with BF Alex Rodriguez at the Miami Beach restaurant Casa Tua, but Cam left the hot spot alone ... unless you count a couple of security guards who helped her out as company, of course.

Even so, the actress looked cute and casual in a white button-down, black bra, dark skinny jeans, gold cuff and turquoise necklace. But her outfit doesn't distract us from one very important question: how did Alex leave the building?!

There's nothing to worry about with this athletic couple though. The two were spotted picking up groceries from a local Whole Foods earlier in the day. But they should be worried about getting quality time in. Find out why ... after the jump.