Australian twins Anna and Lucy share everything in life. Even a fiancé.

Anna and Lucy DeCinque are close. Really close.

So close, in fact, that the identical twin sisters share a fiancé. Oh, and they want to both carry his babies at the same time.

The Australian women, who have claimed the title of 'world’s most identical twins' aren’t shy about their unusual lifestyle, and frankly, they really don’t care what anyone else thinks.

They even starred in a TV show about it: Extreme Sisters on American network TLC.

Since 2017, and on the TV series, they have spoken about their hope to fall pregnant at the same time.

Now, they've taken to their TikTok to answer some of their fans' burning questions, including if their fiancé Ben ever mixes them up.

Watch a new snippet of the twins talking about their shared boyfriend. Post continues below.

Who are Lucy and Anna DeCinque?

Lucy and Anna, 38, dress alike, eat exactly the same meals, do the same workouts and have undergone the same plastic surgeries to keep their bodies, and their lives, as identical as possible.

"We do everything together. We’re never more than a few metres apart, we work [together]. We share everything," they told a UK talk show in 2016.

"When she goes to the toilet, I come with her; when she has a shower, I come with her," Anna told the New York Post.

"You name it and we do it. We're never apart. I don't think we'd function without each other. We have separation anxiety. We're bound to each other."

Perhaps the most surprising aspect of their relationship is that they share a fiancé.

Who is Ben Byrne?

Their relationship with Ben Byrne, who is a fraternal twin himself, is not new. They've been dating for more than a decade.

Dating two women at once might sound like a handful, but this trio have it down pat. They explained the dynamic in a new TikTok.

"Ben is the first guy we've shared," Anna explained, adding that on the night they met Ben, they both shared a kiss with him.

"We knew that we both liked him, and we messaged him straight away on Facebook, and we said, 'Can we share you?'," Anna said.

Initially, Ben thought they were joking (honestly, fair enough), but the twins won him over.

"We weren't joking and he said, 'Yeah, of course'," Anna said.

Image: Instagram/annalucydecinque.

The twins said there's no jealousy in the relationship, which helps them stay drama-free.

"If Ben will kiss Anna, he'll kiss me straight after," Lucy explained.

"It's really an awesome relationship the three of us.

"We wouldn't have it any other way. The three of us are better together."

The twins also addressed a common question: Does Ben ever mix them up?

The answer was simple: "No 🙂🙂."

For them, sharing a boyfriend is much easier than having two separate partners.

"It was great from the start. We just hit it off straight away. It's so much easier for us to share a boyfriend," Anna told the New York Post earlier.

"I don't mind that he comes over to kiss Lucy, because then he's going to kiss me."

"We've had separate boyfriends in the past and it hasn't worked, but now it’s much easier and its great," they told a Caribbean news website in 2015.

"We're with each other 24/7, me and my sister; it's just easier to share a boyfriend because we're always together."

Ben, Lucy and Anna can't get married.

They have been engaged to Ben since 2021, but cannot get married because of Australian laws against polygamy.

"What's holding us back is that you can't marry two people," Ben explained during an episode of Extreme Sisters. "That's our biggest hurdle."

"Which is totally unfair," the twins added.

While the relationship works for them, they acknowledge that others won't be so open-minded.

"People can judge all they want, but we're just doing what makes us happy," they've said.

A baby… at the same time?

On their show, Anna and Lucy documented an appointment with a fertility doctor to enquire about falling pregnant at the same time.

Shocked, the doctor admitted he had never dealt with a situation like this.

"It's not a usual scenario that I'm facing," he said. He concluded that there would be a 1 in 36 chance of their hopes coming true.

"That's not good enough, we're not going to accept that," they responded.

They then looked into IVF, but found more issues as such fertility treatments are normally reserved for those who cannot conceive naturally.

Image: Instagram/annalucydecinque.

The twins said their life was hard because of "all these rules and regulations".

"Marriage and a baby have both been robbed from us because of the way we want to live our life," they said.

In February 2023, they again explained their intentions on ITV's This Morning.

"If it's possible, we'd like to be pregnant together," they said. "At the end of the day, it's how we choose to live our life, and we're happy like that."

When asked if Ben felt the pressure of impregnating them both, they laughed.

"It's double the love for Ben, he understands that we need to be the same, we need to do everything together 24/7," they said.

"We found our everything, we're so thankful we found Ben."

This article was originally published in 2017 and has been updated.

Feature image: Instagram/@annalucydecinque.