Serena Williams proved her ass is buoyant ... floating it down the San Marcos River in Texas this past weekend ... with the guy who played Oliver Queen's sidekick on &quot...
WIN FREE SHADES!►http://goo.gl/Ko1NI4
MY LAST VID!►http://goo.gl/CJJFOj
JOIN THE CREW!►http://goo.gl/5ByJb
Social Media-
Twitter ►http://twitter.com/Overboardhumor
Instagram ►http://...