The Britain's Got Talent star was caught on camera going 51mph in a 30mph zone.
He had been judging a school competition in Brighton on 13 November.
Piers did not appear at Brighton Magistrates' Court on Tuesday.
He was also given 6 penalty points on his licence and ordered to pay £58 costs.
‘I was judging a charity show called Roedean's Got Talent,' the 45-year-old told the BBC.
‘Unfortunately, my driving skills afterwards would not have got me past the first round.
'And I thoroughly deserved a red buzzer from the courts.'
A Sussex Police spokesman adds: ‘The vehicle he was driving was doing 51mph in a 30mph zone, above our threshold for issuing a fixed penalty notice.'
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