The two sisters are relocating to `The Big Apple` to open a new DASH Boutique store. The pair have already opened shops with their sister Khloe in Miami and Calabasas, California.

The set-up stage and opening of the boutique will also be filmed for a new E! reality TV show.

Writing on her blog, Kim, 29, revealed she has decided to join Kourtney, 31, her boyfriend Scott Disick and the pair?s nine-month-old son Mason in New York to ensure their third store is a success and to spend more time with her nephew.

She revealed: "I could not be more excited to spend the next couple of months in one of my favourite cities! When we decided to open a new DASH store in the city, Kourt and I felt that someone needed to be here to help out with the store and make sure everything was running smoothly.

"Not only do I get to spend some quality time with Kourt, I also get to hang out with Masey as much as I want. I can`t imagine being away from him for so long!"

Khloe will not be joining her sisters in New York, instead staying in California with her basketball player husband Lamar Odom, but admits she is jealous of her siblings` new venture.

Speaking about her time in Miami with Kourtney - which was filmed for the reality series `Kourtney and Khloe Take Miami` - the 26-year-old star said: "This was something that helped me and made me stronger and I think it`s perfect timing for Kim to do the same. I hope she can take away from this experience what I did and I`m so excited for both of them.

"I can`t think of two hotter b****es to be strutting around the streets of Manhattan and I won`t be missing a single episode. Get ready, New York!"
sections: Celebrities