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Kim Kardashian and her big sis Kourtney are preparing to wreak havoc in the Big Apple in the upcoming E! series Kourtney and Kim Take New York.

After arriving in the city, Kim tweeted, "Fireworks over the Brooklyn Bridge. Welcome to NYC, bayba baaaybay!"

The new show, debuting in January, will follow the two drama-filled sisters around NY ... and will also feature Mason's on-the-edge baby daddy Scott Disick. Poor Khloe ... she gets married to Lamar Odom and gets the boot! However, no doubt, Khloe and the rest of the Kardashian clan will be making cameos here and there.

Reports claim that Kourtney may be looking to expand her family this season. Someone bust out the boxing gloves for Scott and Kourt's mom Kris Jenner.

Loves it!