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Robbie Williams with girlfriend Ayda Field Image Credit: Rex Features

She is the woman Robbie Williams credits with helping him conquer his well-publicised demons and — learn to love again.

And on Saturday night, the superstar singer confirmed his commitment to long-term girlfriend Ayda Field, who he playfully calls his Swiss army knife — as they were married in an intimate ceremony in front of a handful family and friends in his £13 million (Dh76 million) Beverly Hills mansion.

Williams, 36, was so insistent on keeping the wedding venue secret that even the couple's closest friends were uncertain of the details.

A friend of 31-year-old actress Field said: "The save the date cards that went out two weeks ago only said it was a party to celebrate Robbie's 20 years in showbusiness.

"It was only in the last few days that news leaked out that it was going to be a wedding. Robbie is the happiest I have ever seen him. He says that until Ayda came along he didn't know what it was like to be truly happy. He credits her with teaching him how to learn to laugh and love again."

But Williams is taking no chances with his £80 million fortune. The couple reportedly signed a pre-nuptial agreement two weeks ago, which guarantees her £2 million for every year of marriage but protects the bulk of his empire.