The England captain has had his long blond hair hacked off and showed off his new crewcut in London on Monday.
No-one expected him to turn up at the showbiz event in London with wife Victoria, and his new hairstyle was an even bigger surprise.
Now lots of kids are expected to copy the style, in some cases risking being sent home from school.
Every time Becks changes his hair many of his fans choose to copy it, and some of the styles aren't popular with teachers.
Becks was at an event to celebrate the 19th birthday of 19 Management, who used to look after the Spice Girls when they were famous.
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