Serena Williams flashes her bum-bum while showing off her aquatic skills underneath water during Bahamas vacation (Photos)

American tennis star, Serena Williams shared a new post to Instagram documenting her time in the Bahamas with her family.

The 40-year-old tennis legend shared a new post to Instagram documenting her time on the island while flashing bare backside underneath the water.

Serena Williams showed off her aquatic skills, as she went into the underwater world in a long-sleeve, blue swim shirt and floral print bikini bottoms. She captioned: 'Vacation.'