Making it hard to believe they each have two kids, they left little to the imagination as they showed off their slimline physiques in barely there black swimwear on Saturday.
The celebrity pals are enjoying some adult time away from their children by vacationing with a group of friends.
They all soaked up the sun as they floated in the ocean on inflatables.
It's no wonder Richie was keen to strip down since she's been working hard to get her body in shape with intense training sessions with Tracy Anderson and dieting on Pressed Juicery Cleanses too.
Alba recently confessed to Women's Health magazine however that she 'hates' exercising.
"I like doing dance classes. That's fun," she said. "Like hip hop class, mixed with like core pilates-type exercises. And sometimes I do sprint intervals just because I hate working out."