Luxury brand Louis Vuitton is quick to sue anyone who misuses their brand. LVMH legal department has filed lawsuits against major corporations such as Hyundai (for infringing on its brand in a car commercial); and Warner Brothers (for using a fake bag in the movie Hangover 2).

Now LV has set their sights on celebrities such as Justin Bieber and Jaden Smith for wearing clothing using the fake Louis Vuitton monogram.

Celebrities are known for hiring tailors to construct clothing using famous, but fake brand names. Now Louis Vuitton is cracking down on the brand thieves.

This week, Bieber, 18, wore a jacket to the Consumer Electronics show (CES) in Las Vegas that caught the eye of fashionistas who thought the jacket was custom made by the iconic brand. But a rep in the LV corporate office told us exclusively: “The jacket Bieber is wearing is a cheap knockoff of the Louis Vuitton brand.” The rep pointed out the red LEVI’s tag on the jacket pocket as proof that the jacket is a counterfeit.

In an exclusive statement Sandrarose.com, the LV rep said:

“Anything unauthentic, whether worn by a famous individual or not, is seriously frowned upon.”

Calls to Justin and Jaden’s reps were not immediately returned.