Chat show host Piers - who already has three sons from his 20-year marriage to Marion Shalloe, whom he divorced in 2008 - first met Celia on a photoshoot, claiming she was "way out" of his league.
He then proposed to the 34-year-old beauty while on a romantic trip to Paris by presenting her with a book by her most-loved writer John Updike, entitled 'Marry Me'.
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Piers Morgan trying too hard to make an impression on CNN
The pair then tied the knot in a quiet ceremony, where he neglected to even invite fellow 'Britain's Got Talent' judge Simon Cowell to the nuptials.
He said: "I couldn't trust him to turn up on time."
Simon later retorted: "I hate to admit it but I'm absolutely thrilled for the two of them. Having met Celia, I have no idea how he managed to pull this one off."