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A Reuter's fluff piece detailing the wonder and productivity of Google employee benefits (in this case, the splendor of getting a haircut in a Winnebago without ever having to leave work) allows Dena Kaufer, operator of Onsite Haircuts, to reveal:

One of the two Google founders (billionaires Sergey Brin and Larry Page, both of whom keep their hair short) has been by to get a cut, Kaufer said. She declined to say more, adding that she has signed a nondisclosure agreement. She had reason to keep quiet: A company minder monitored her conversation with a reporter.

The NDA and "company minder" were a wise move. Neither Sergey nor Larry would want it known who got the cheap haircut. Some secrets are simply sacred.