Zack Kalter, Becca Tilley & Robert graham
The Bachelor and Bachelorette alumni heat up Las Vegas at the iHeartRadio Pool Party.
Alexis Bellino
The Real Housewives of Orange County alumna shows off her bikini body at Encore Beach Club at Wynn Las Vegas.
Justin Bieber
The "Baby" singer shows off his impressive abs while visiting the Upper Breathe Lounge at the Hard Rock Hotel & Casino.
Katharine McPhee
The singer and actress shows some skin at Azure Luxury Pool at The Palazzo.
Will Smith
The Fresh Prince of Bel Air star shows off his abs while singing along to "Jump On It" at Palms Casino Resort Ditch Fridays pool party.
Cast of Total Divas
The WWE hotties sizzle while celebrating Nattie's bachelorette party poolside at The Palms.
Tamra Barney & Eddie Judge
The Real Housewives of Orange County stars have some prewedding fun at the Azure Luxury Pool at the Palazzo.
Maksim Chmerkovskiy & Val Chmerkovskiy
The Dancing duo lather up for for Olay's Ultra Moisture Body Wash event at the Aria.
Sean Lowe & Catherine Giudici
The Bachelor couple sizzle at LIQUID Pool Lounge.
Kendra Wilkinson-Baskett
The reality star kicks off pool season at Wet Republic in a white bikini.
Gretchen Rossi
The Real Housewives of Orange County newly engaged star poses by the pool at the Sapphire Pool and Day Club at the Rio Hotel and Casino.
Michael Phelps & Ryan Lochte
What better way to celebrate Olympic Gold medals than by the pool with beautiful ladies and cake?
Kate Upton
The Sports Illustrated swimsuit issue cover girl is so good at this, she shows off her hot bod while showing off her hot bod.
See more pics of the swimsuit models in Las Vegas.
Jennifer Lopez
Before her evening performance, the "Jenny From The Block" singer visits a pre-concert party at Wet Republic at MGM.
Brandi Glanville
The Real Housewives of Beverly Hills star hosts the second annual Single & Fabulous Party at Tao Beach.
Derek Hough & Karina Smirnoff
Instead of showing off their impressive moves, the Dancing With the Stars professionals mix it up as DJs by the pool.
Kendall & Kylie Jenner
Sporting bikinis from their Kardashian Khaos store at the Mirage, the sisters visit the hotel's pool.
Maria Menounos
The TV host celebrates Cinco de Mayo poolside at the Bud Light Lime "Lime-A-Rita" party.
Kirsten Dunst
The actress takes a break from working and enjoys some rest and relaxation at a local resort.
Prince Harry
The royal hottie is spotted shirtless at a pool party. He would later create a royal scandal with nude party photos.
Whitney Port
Taking a break from her fashion line, the former MTV reality star soaks up the sun at a pool party.
Cheryl Burke
The DWTS dancer shows off her fit figure at the Aria Resort.
Giuliana & Bill Rancic
The E! News host surprises her husband with a 40th birthday party at the Palazzo Hotel.
Holly Madison
The PeepShow star shows off her pre-pregnancy figure at Encore Beach Club.