The 2008 world champion had his ears pierced last week, while in Los Angeles to see his girlfriend Nicole Scherzinger perform on a dance television show.
But when he pulled his balaclava and helmet over the studs on Friday morning, some sections of the media recalled article 2.2.1 appendix L of the sporting regulations.
The section prohibits drivers from wearing jewellery for safety reasons.
“The wearing of jewellery in the form of body piercing or metal neck chains is prohibited,” reads the rule.
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