The actress, 28, was apparently spotted by officers as she drove away from traffic lights in her silver 4x4 in Tunbridge Wells, Kent.
‘The officers didn't treat her differently than anyone else,’ an onlooker tells the Daily Mirror.
‘They explained it was against the law and gave her a stern talking-to.
‘Kelly became really tearful and seemed incredibly embarrassed. She was apologising over and over again.
'She wasn't looking for any special treatment despite being famous and accepted the ticket in good grace.’
A source close to the star later said: 'She's really sorry for what happened.'
Kelly's rep was unavailable for comment.