Kelly Bensimon is 43 and looking fabulous!

The Real Housewives of NYC star is flaunting her ripped bikini bod on the cover of Shape Magazine.

As for how she keeps toned and tight, Bensimon says a healthy lifestyle helps. She tells the mag:

    “My body is like a Ferrari. I know what it needs to run well — and that doesn’t include drugs, alcohol, or cigarettes.”

How bout' a test drive?