Party pieces, run by Kate Middleton's Millionaire has been parents, Michael and Carole, use the red and white "X" logo on your website.
It asks customers, if you have "got the X factor" and used the icon based on the smash ITV1 show promoting the parties.
But a show source insisted boss Simon Cowell not the use of the image, the party accessories department store had licensed.
The insider said: "You definitely do not have permission to do so." "It's strange, a company first check with us would not."
The plug at the law firm Web site times makes mistakes in spelling the show name with a hyphen and repeatedly with a lowercase letter "f".
It says: "calling all X factor fans!""Pump up the volume to organize rock the Mike and an X factor extravaganza for friends and family."
Customers are then tried to buy items such as such as plates and bowls.
And the site cheeky beats party bags with items cheaper than to fill the show official merchandise.
Last night the section was quickly from the website entfernt.Ein X factor spokesman said: "this has just drawn our attention above.the team look into."
Party pieces's parents of 28-year-old Kate 1987 until set.
She has worked on and turn off as a photographer and marketing chief for the last three years.
But you helicopter is now believed to much of their time with RAF pilot rescue William, 28, in Wales life spend.
St. James's Palace referred calls party pieces.
The company reacted requests for comment but not to the Sun's.
j.Clench@the-Sun.co.UK
