Big Brother's Season 15 Cast Pose in Swimsuits for First Photo
06/25/2013 AT 12:10 PM EDT
The season 15 houseguests entered the Big Brother house just a few days ago and wasted no time making themselves at home poolside. Here's your first look at the group.
But the 16 houseguests – the largest cast in the CBS reality show's history – will not be spending all summer relaxing under the sun.
In a new twist, the show's two nomination chairs have been replaced by a "nomination couch" to make room for a third nominee's eviction every week. And a new power will be in play this summer as fans vote weekly for a "Big Brother MVP," whose special power will be explained by host Julie Chen.
"It is going to be an entirely new game. I don't even know if I could play it," says season 13 winner Rachel Reilly, whose sister Elissa Slater will be competing this year. "There is no way for anyone to float through."
Endurance will also come into play more than ever, as the houseguests settle in for a record 100 days.
"I think it is going to be really hard for the houseguests. The season I won I was in for 76 days and that was forever," Reilly tells PEOPLE. "As a fan I am so excited for two extra weeks of Big Brother, but I feel bad for my sister. It is going to be insane."
Big Brother premieres June 26.