She enjoyed some downtime with her family while staying at a luxury hotel in the South Of France.
The athlete looked incredible in a colourful swimsuit which boasted panels of bright yellow and pink and was seen cosying up to her husband Alexis Ohanian in between jumping into the cool water.
Relaxing: Serena Williams looked incredible as she rocked a colourful swimsuit and enjoyed some downtime with her family while staying at a luxury hotel in the South Of France
Serena appeared to be in great spirits while making the most of the sunshine, with the star beaming smiles and laughing as she chatted to her beau.
After looking at the refreshing water for a few moments, Serena and Alexis took it in turns to launch from the stone side and diving board into the sea.
They both seemed to be having a fabulous time larking around, with Serena also using a small metal ladder to get into the water.
Serena donned a striking one-piece for the outing which featured a small strap around her neck and accessorised with a small gold necklace
Happy couple: The athlete was also seen cosying up to her husband Alexis Ohanian (left) to take a snap in between jumping into the cool water (right), with the duo eyeing up the water before launching off the side and a diving board
Alexis also caught the eye in a pair of brightly patterned swimming trunks, with the Reddit founder leaving his long brunette locks down for the dip in the water.
Going for it: Serena perched on the end of the blue diving board and put out her arms for some balance before jumping off
Impressive! She appeared to be in great spirits while making the most of the sunshine, with the star beaming smiles and laughing as she jumped from a metal staircase into the clear water
Making a splash: The athlete closed her eyes and threw out her hands as she landed in the water from the ladder
Quality time: Alexis donned a pair of brightly coloured swimming shorts while Serena opted for a striking one-piece
Brave: The Reddit founder also leapt from the blue diving board into the water, seeming to have no fear about the drop 
Smile! Alexis seemed to flash a grin at someone standing on the side as he made the speedy descent into the water
Heading in: After larking around for some time, the married couple turned around and headed back up the stone staircase
Stunning: Serena donned a striking one-piece for the outing which featured a small strap around her neck and accessorised with a small gold necklace
Making memories: The parents, who share three-year-old daughter Olympia, took in their stunning surroundings with the tennis pro snapping a quick picture before going up the stairs
Brace for it! The star put on an animated display as she hit the sea and threw up her hands, suggesting it was a little colder than she expected
Serena and the Reddit cofounder were married in New Orleans November 2017, just a month after they welcomed their first child- daughter Olympia.
Bit cold? Serena seemed shocked by the temperature during one dip
Coming in? Nobody else seemed too keen to follow her down the steps and into the chilly water