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The multimillionaire singer Enya is a mysterious recluse who swore off love, lives in a castle with cats and sings in a make-believe language, a fascinating new profile of the star reveals.

The 54-year-old “Sail Away” singer — whose moody new-age tunes often throb through day spas and dental offices — was outed last week as the richest female in British and Irish history.

She boasts a $169 million fortune and has sold more than 75 million albums, beating out the chart-topping boy band One Direction, the UK Sun reports.

But nobody — including neighbors, relatives and paparazzi — knows much about the oddball artist, who’s been seen leaving her Dublin home only twice in the past decade, the British tabloid reports.

“She’s not exactly a barrel of laughs. You wouldn’t go for a few pints with her,” a friend told The Sun, adding she comes off “serious and precious.”

Her uncle Noel Duggan added, “We don’t see much of her. She lives like a queen. She is a recluse.”

Cats are her closest companions, in part because men find her “dark and difficult,” she once said, according to The Sun. At one point, she had a dozen of the furry friends.

Instead of socializing, she spends her time holed up in her sprawling Victorian mansion, toiling over her tunes.

To keep her creative juices pure, she refuses to listen to music made by any other artists. She won’t go on tour or respond to fan letters and spends nearly every waking moment with an elderly married couple with whom she makes her music, The Sun reports.

Enya spends months on every detail of her songs, some of which are overdubbed with vocals more than 500 times.

And she sometimes sings them in Sindarin and Quenya — made-up languages created by “Lord of the Rings” author JRR Tolkien.

Her financial success is tied to her 2001 single “Only Time,” which CNN used as a backdrop to 9/11 footage months after its release. She later gained fans after she released it as a charity single.

But none of her peers imagined her music would become so popular.

“Nobody at the record company thought she’d ever be this big. And it’s almost impossible for anyone to become so huge without touring or promotion, let alone singing ethereal tunes in a weirdo language,” one source told The Sun.

An industry source was baffled by her fame.

“Throughout the music business there’s no one else who is so successful about whom so little is known. She doesn’t socialize, she’s barely seen out of the house, there aren’t any clues in her lyrics about her life,” the source said.

“Even at her album launches, label bosses will hold a large event rather than ask her to do individual interviews, as they make her so uncomfortable. She’s a huge question mark,” the source said.

She may be quirky — but she has plenty of diehard fans.

“When she bought the castle there was a lot of work done and plenty of money put into security — cameras, gates and lights. People come looking for it from all over the world but you can’t see through the gates. You wouldn’t even know there was anyone there most of the time,” a local told The Sun.

The singer has previously admitted to choosing music over men.

“After a bad day in the studio I’m dark and difficult to be with, I want and need to be on my own. What sort of man would be able to adapt? Falling madly in love and getting married would be the most horrific thing that could happen. My affairs are with melody and words and beautiful sounds,” she said.

“I had partners. But I find long relationships, well, how can I say it without appearing strange? I’m too much devoted to my music. Some people think it sounds sad but believe me, I’m happy. I am my music,” she said.

The singer, who got her start in a Celtic family band at age 19, called music “my first love and my present love.”