By Breaking Celebrity News Staff

It should be illegal to look this good.

Yes, that was Rihanna showing off her ridiculously gorgeous looks and sexy bikini body on a yacht in Saint Tropez on Tuesday.

The 23-year-old S&M singer showed off her perfect form in a brash blue bikini, revealing her flat stomach and ample bust. Her long, wavy hair was draped around her exotic high forehead, as she enjoyed the beautiful day lounging on a yacht off the French coast with pals.