Francesca Pascale used the popular WhatsApp messenger service to declare her love.
In a status which was posted on Twitter by writer Selvaggia Lucarelli, she said: “For better or worse, in health or in sickness, whether rich or poor, I promise to love you and honour you every day of my life.”
The status was surrounded by emoticon hearts and stars for good measure.
Lucarelli joked, “she’s running a big risk to love him in poverty”.
In August, Italy’s highest court found Berlusconi guilty of tax fraud, banning him from public office and handing down a one-year prison sentence. The Senate will soon vote on whether the former prime minister should be expelled from parliament, although he will likely serve the jail term under house arrest.
While such a conviction might prompt any other billionaire’s lover to pack their designer bags, the Naples-born Pascale is determined to sit out the storm.
Shortly after the tax verdict, Pascale was by Berlusconi’s side as he defended himself in front of his adoring fans in Rome.
She may well be taking this low point in the 76-year-old’s career to assert her position within Berlusconi’s circles after being sidelined in recent months.
In December, Berlusconi announced his engagement to Pascale, saying she brought him “continuous joy”, although even he admitted the age gap of nearly half a century was a tad “excessive”.
Reports quickly spread that Pascale was being groomed as Berlusconi’s “first lady”, although as national elections loomed in February she seldom appeared with her man.
This might have had something to do with a YouTube clip of a bikini-clad Pascale dancing provocatively on a beach while eating an ice lolly, which quickly went viral,
But Pascale has done her best to reform her reputation, winning the politician’s heart with a “We miss you, Silvio” campaign.
She appears committed to a lifetime of love with the twice-divorced Berlusconi, despite him currently appealing a conviction for having sex with an underage prostitute.
In a related case, ex-showgirl Nicole Minetti and two others were found guilty of procuring prostitutes for Berlusconi. During the trial earlier this year, Minetti declared her “true love” for the politician.
But not everyone has enduring love for Berlusconi. In 2009, Veronica Lario, his wife of 19 years, announced she was divorcing the billionaire. One of the key reasons, she said at the time, was his habit of “frequenting minors”.