RYAN LOCHTE

Medal count: 2 gold, 2 silver, 1 bronze
The U.S. swimmer celebrates his 28th birthday belatedly at an Aug. 7 American-style shindig at London's Planet Hollywood. His swim-team friends, including Michael Phelps, were on hand to help the famously single Lochte celebrate well into the night.

Planet Photos/ZUMA; Dave M. Benett/Getty