She spends endless hours at the gym, keeping herself in tip-top condition.

But it looks like it is time well spent after tennis ace Serena Williams showed off her amazing bikini body while she enjoyed some rest and relaxation on Miami Beach, Florida.

The multi-millionaire star looked amazing as she emerged from the warm waters in a floral high-cut green bikini, which highlighted her washboard abs, plus toned legs and arms.

Body Beautiful: A stunning Serena Williams emerges from the warm waters of Miami Beach in Florida on Wednesday.

Looking good: Serena’s bikini body looked amazing as she enjoyed the sights and sounds of Miami Beach

Happy lady: Serena seemed to be having plenty of the fun as she splashed around in the ocean

Wearing her long hair down, Serena – who donned some designer sunglasses – seemed totally happy and relaxed as she hit the beach with some female friends.

Serena constantly smiled while taking a dip in the ocean before kicking her feet in the sand as she took a well earned rest from the rigors of the tennis court.

And with such an amazing body the 42-year-old fitted in perfectly with all the other beautiful models and actors who love to show off their stunning forms on the iconic Florida beach.

Dangerous curves: Serena showed off her shapely body in her bright green bikini

Time for a rest: Serena heads off to the sun loungers after swimming in the ocean

Heading out: As the sun began to go down, Serena was ready to head home