Sienna Miller was jumping up in the ocean when her bikini top went down and gave a very embarrassing slip.
California must be warmer than the midwest because Sienna was laying out at the beach when she decided to cool off in the water. A combination of crashing waves, running, and a skimpy bikini led to a brief moment that did not escape the paparazzi eagerly waiting for a money shot. She fixed her top up as soon as the problem occurred, but it was already too late.
This is the second time in less than a year Sienna has fallen victim to a malfunction. Check out the previous one here and see more pictures of Sienna Miller below.