The Britain's Got Talent judge proposed to his girlfriend while the couple were on holiday in France.
A statement on Morgan's official website read: "Piers has taken the plunge and proposed to his girlfriend of four years Celia Walden - and she said yes!
"The happy event took place last week in that most romantic of cities - Paris, where the couple were celebrating Celia's birthday."
It continued: "Back in June, Piers told Radio 4's Desert Island Discs presenter Kirsty Young that he had got Stevie Wonder to record a little video proposal just in case he ever wanted to pop the question.
"We'll look forward to finding out whether or not he used it or decided to go with his own words! For now though, it's congratulations all round!"