(Cover) - EN Star Style - The Kardashian sisters want to bring their Dash clothing boutique to New York's Upper Eastside.

Kourtney Kardashian let slip that her successful siblings, including Khlo and Kim, are looking to expand their business while on a shopping trip in the expensive area.

The sisters, who found fame on their reality TV show Keeping Up with the Kardashians, already have a boutique in New York's Soho area.

"Dash is doing so well, we are really looking to expand here," Kourtney told sister Khlo while browsing in Alison Brettschneider's store 25 Park.

The fashionista was also overheard by an onlooker who told the New York Post that the location would be perfect. Kourtney has son Mason with partner Scott Disick's, whose parents live in the area.

A spokesperson for the sisters has revealed that they are always on the look-out for new areas to expand their fashion empire.

"They are always looking to expand and always looking at retail spaces in different areas," he said.

The original Dash boutique was founded by Kourtney, Kim and Khlo and opened in Calabasas, California, in 2006. The sisters also operate a store in Miami. (C) Cover Media