Doing their best to branch out in business, Kim and Kourtney Kardashian were hard at work at the Mirage Resort Hotel and Casino in Las Vegas on Monday. Flying in with mom, Kris Jenner, via private jet, the E! reality stars were in town for a press conference announcing the Kardashian Khaos store opening.According to reports, the Kardashian gals' new shop will be opening in mid August - with plans to showcase a line of Kardashian family designs.Tweeting prior to the event, Kim wrote to her many fans and followers, "Hey dolls! We partnered w @themiragelv @bravadaltd @tlkfusion & r opening a Kardashian Retail Store! More info at press conference today."