WENN/com
Credit: Judy Eddy/WENN.com

One Night for ONE DROP Charity Event at Hyde Nightclub inside the Bellagio Resort and Casino in Las Vegas brought out a few Olympians and a few others.

Swim champ Michael Phelps, who on his off time likes to party, probably tied a few over. Also spotted, Missy Franklin and Erin Cafaro, plus new mom Holly Madison and seldom seen these days Pamela Anderson.