Crowds move to the beat of deejay music at the Rehab pool party in the Hard Rock Hotel in Las Vegas. (Gina Ferazzi / LAT)
Guests at the Bare party stay cool in the infinity pool at the Mirage Resort hotel. (Gina Ferazzi / LAT)
A woman tanning herself covers her eyes from the hot sun during the Rehab pool party at the Hard Rock Hotel. (Gina Ferazzi / LAT)
A guest cools off under the waterfall at the Rehab pool party at the Hard Rock Hotel. (Gina Ferazzi / LAT)
Crowds socialize in the pool during the Rehab party at the Hard Rock Hotel. (Gina Ferazzi / LAT)
Swimming pool events like the Rehab pool party at the Hard Rock Hotel have become the new night clubs. (Gina Ferazzi / LAT)
