Fans of the 49-year-old actor crowded into the courtroom to catch a glimpse of the star, battling with extra police called in to keep the growing crowd of mostly middle-aged women under control, Sky News reported Saturday.
The judge had to call for order several times and finally halted the Milan trial because of noise and photos from a gallery packed with Clooney admirers, The Mirror reported.
On trial are three men accused of creating a "GC Exclusive by George Clooney" clothing line and using falsified documents and photographs to mislead suppliers into believing they had the actor's backing, the Los Angeles Times reported.
"I am here because I believe in justice," Clooney said as he entered the court. "I am here to speak because some people are trying to use my name to gain advantage not over me but of others."
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