Pippa Middleton's party-planning book was better received in America than back home in the UK, and now the family business could be coming to America too.

Michael and Carole Middleton are planning to expand their Party Pieces website to the US and are thinking about setting up shop in New York, according to the New York Daily News.

"Party Pieces overseas business has been extraordinary with America dominating much of the interest. It has prompted the Middletons to look at establishing an office in the U.S. so that they can bolster their brand and even tie into other companies and ventures. They feel New York offers them a good starting point," a source told the paper.

The News adds that when Pippa was last in New York and assumed to be apartment hunting, she was actually scouting for office space.

“The Middletons have been extremely careful not to upset Buckingham Palace by seemingly trading off Kate’s link to royalty,” the source added. “I am not sure if they will even announce the move or just let it happen and move on from there. They are adamant they will never trade off Kate’s royal links to get ahead in business.”