In the clip, Witherspoon, 40, grins at the camera while wearing a snakeskin halter one-piece swimsuit before diving in the water.
The Oscar winner is currently enjoying some downtime with pals. The group of ladies first traveled to Venice, Italy, where they sipped local Spritz cocktails, visited the Peggy Guggenheim Museum, and sped through town on a boat.
The mother of three is enjoying some kid-free time, but that doesn’t mean she doesn’t adore goofing off with her kids. Watch the clip below to see Witherspoon pal around with her 3-year-old son, Tennessee.