Teaming up for a book plugging meet and greet, Kourtney and Khloe Kardashian joined forces at a Calabasas, California Barnes & Noble on Monday night (December 12).

The E! reality stars had a special treat in store for fans who’d been waiting in line for hours, as fellow sisters Kylie andKendall Jenner also turned up at the “Kardashian Konfidential” press session.

The appearance comes just as Kendall posted a message revealing that the amily is set to trek to Sin City for the grand opening of Kardashian Khaos at The Mirage later this week.

The 16-year-old wrote, “Kylie and I will both be attending the GRAND OPENING of Kardashian Khaos at The Mirage in Las Vegas this Thursday evening!!! We’re so excited to see all the fun souvenirs in the store! This tote bag is toooo cute!”

Miss Jenner added, “The whole family will be heading to Vegas to celebrate the opening and we would love to see you there, so if you’re in Vegas come visit!!”

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Public Appearances > 2011 > Barnes & Noble – December 12, 2011