Kim Kardashian was joined by her sisters Khloé Kardashian and Kourtney Kardashian and her best friend, Jonathan Cheban, when she visited Miami this week.The sisters are in town for the grand opening of their new Dash store and to film scenes for their reality show, Keeping Up With the Kardashians — between shooting scenes at the famed Versace mansion, Kim, Khloé, and Kylie did some shopping in South Beach. The sisters' show is now reportedly at the center of a big investigation into two recent thefts at Kourtney and Khloé's homes. Earlier this year, Khloé's former home with Lamar Odom was robbed of $250,000 in jewelry while Kourtney found $50,000 in cash missing from her mansion. Police said they thought the two robberies were connected, and it was initially suggested that the thieves might have known Lamar. However, now TMZ is reporting that the police believe that someone on the crew of Keeping Up With the Kardashians could be involved, as the robberies suggested they were performed by someone who knew the inside of the sisters' homes.