Khloé Kardashian and Kendall and Kylie Jenner are taking action. The reality stars have cancelled some upcoming appearances due to security concerns after Kin Kardashian was robbed at gunpoint in Paris, reports Us Weekly.

"Appearances are being cancelled for them because of the robbery," a source told the mag. "Kendall, Kylie and Khloé have cancelled upcoming book signings."

Khloé was slated to promote the paperback edition of her New York Times bestseller Strong Looks Better Naked, due out October 18. The Jenner sisters' were supposed to do events for the debut of their second novel, Time of the Twins: The Story of Lex and Livia, which will be released on November 15.

Another source added, "The family is all on lockdown right now … They're deciding when to discuss the situation and how to move forward."

We reported earlier that E! has put filming Keeping Up With The Kardashians "on hold indefinitely" after Kim's Oct. 3 robbery.

BTW: we have some deets about the new ring that was stolen during the $11 million robbery ...

Last month, the 35-year-old told Andy Cohen during during the Girls' Lounge event that her husband, Kanye West, bought the ring for her after closing a deal with Adidas in June to open Yeezy retail stores; the deal is estimated to be worth billions, according to Forbes. Kim gushed to Andy that he woke her up in the middle of the night and presented her with a Lorraine Schwartz box that had an emerald-cut 20-carat diamond ringdiamond ring inside with the word "Adidas" engraved in it.


Meanwhile, Khloe may be laying low in regards to being in public -- but she's definitely still flaunting it on Instagram. The 32-year-old just broke her Instagram silence to promote her denim line, Good American.

Khloe posted a sexy Instagram with the caption, "Countdown to the launch of my denim brand @goodamerican begins! 12 days until you can shop goodamerican.com #goodsquad."