Bravo’s “Real Housewives of Miami” star Joanna Krupa and her sister Marta Krupa soaked up the sun and launched round 1 of the second annual Rehab Bikini Invitational at the Hard Rock Hotel on Saturday. During a break in the invitational, the sisters received a surprise when they were presented with a two-tiered pink and black cake in honor of their recent birthdays. Crystal Hefner, Rehab Bikini Invitational’s resident deejay, was on hand to set the sounds for the event and even brought along some fellow Playboy Playmates to watch the competition. Additional Rehab Bikini Invitational dates include June 14, July 12 and Aug. 9, leading up to the finale on Sept. 6. On Sunday, Travie McCoy of Gym Class Heroes performed at the poolside oasis. McCoy kept the crowd energized as he sang his hit singles “Bad All By Myself,” “Keep on Keeping On,” “Stereo Heart” and “Billionaire.” REHAB revelers went wild singing loudly to the chorus of “Billionaire.” The performer made sure to show his appreciation for the crowd yelling “I feel like there’s a lot of love at REHAB today!” and “I’m going to play one last song, then hangout and get drunk with you guys!” Click on the photos below to enlarge. Like Haute Living Las Vegas? Join our Facebook page or follow us on Twitter. Want Haute Living Las Vegas delivered to your in box once a week? Sign up for our newsletter.