Nervo twins DJing at Encore Beach Club

In fact, Liv and her twin sister were accepted into Opera Australia academy – but they turned down that career path.

"We were too busy, running off to a studio to record for a pop producer," Liv says, her accent sounding as Australian as you’d expect.

So I ask her (in a quiet VIP room at Wynn Las Vegas-Encore): Does that mean you can sing "Ave Maria"?

"Yes, I can. But I’m not going to," she says with a laugh.

The Nervo twins – performing today at Encore Beach Club – learned piano starting at age 7. They were lovingly encouraged by their parents, who are academic-dentists, she says.

I look at her teeth. They are very pretty and clean.

"We know (music) theory and all that boring stuff," she says. "Music always came easy, and we love what we do, so it doesn’t feel like working."

Anyway, the Nervo twins started their career as songwriters, penning tunes for Ke$ha, the Pussycat Dolls and other pop singers.

They co-wrote the Grammy-winning "When Love Takes Over" with David Guetta and Kelly Rowland.

One day, they decided to keep their songs for themselves.

"We always sung our demos, especially when we were writing for pop artists," Liv says.

"Sometimes, it’s more a pain in the butt to find a singer to replace it. That’s how our first single happened. We just couldn’t find a singer to replace (demo vocals), and we were like, ‘Should we just keep our vocals?’ "

Their music taste gravitates toward electronic. Then Guetta encouraged them. He asked them to open for him as a DJ duo.

"He’s the friendliest guy on earth," Liv says. "He gave us the kick up the ass we needed."

DJing is a completely different skill than playing piano, writing songs and singing. (Liv also plays guitar; she writes best on it rather than on piano, she says.) But they worked on DJing "bit by bit."

That led to original electronic singles that are fun, as in "We’re All No One" featuring Afrojack and Steve Aoki; and "The Way We See The World" with Afrojack, Dimitri Vegas and Like Mike.

When Nervo performs at Wynn-Encore clubs, rabid fans crowd the front of their booth, holding signs and expressing love.

The twins – the happiest, smilingest DJs I’ve ever seen – often repay devotion by hugging front-row fans before a gig and posing for photos with them.

The Nervos are strikingly pretty and tall. When they were teens, they did some modeling. But when I bring this up, Liv brushes it off with typical Australian humility.

"We were 16," she says. "I was working in a chicken store to make pocket money. It’s called Nando’s and it’s delicious, actually. It’s a chain. I was the cashier. I was getting paid, like, $2.75 or $4.75 an hour.

"Mom and Dad got sick of seeing us work so many shifts at Nando’s chicken store that they submitted a family portrait of us to an agency. So we were models.

"I’d love to say I’m a runway model, but no," she says. "We did some stuff in the beginning – which I hope never comes out!"

By the way, at the end of this interview, Liv gave me kisses on both cheeks. I thought you should know that for the sake of full disclosure, to know why I extra love them.

Doug Elfman’s column appears Tuesdays, Thursdays and Fridays. Email him at delfman@reviewjournal.com. He blogs at reviewjournal.com/elfman.