Newly-engaged Laura Prepon flashes a beaming smile as she walks the red carpet with her fiancé Ben Foster at the Inferno premiere in Florence

They went public with their engagement at The Girl On The Train premiere in New York earlier this week.

And Laura Prepon and her new fiancé Ben Foster once again walked the red carpet arm-in-arm, this time attending the Inferno premiere together in Florence on Saturday evening.

The Orange Is The New Black actress flashed a radiant smile - and her sparkling new engagement ring.

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Happy couple: Laura Prepon and her new fiancé Ben Foster once again walked the red carpet arm-in-arm, this time attending the Inferno premiere together in Florence on Saturday evening

Happy couple: Laura Prepon and her new fiancé Ben Foster once again walked the red carpet arm-in-arm, this time attending the Inferno premiere together in Florence on Saturday evening

She showed off the significant piece of jewelry - a gold band with large solitaire diamond - as she linked arms with the Warcraft star.

Laura was elegantly dressed in a simple black dress with a polka dot lace overlay.

The 50s style garment was cinched in at the waist with a patent leather belt, and set off with a pair of pointed suede pumps.

The actress wore her raven hair down loose and maximised her piercing gaze with heavy eye make-up.

Rumours that the couple were dating first emerged earlier this summer when they were pictured out in New York together.

Beaming: The Orange Is The New Black actress flashed a radiant smile - and her sparkling new engagement ring

Beaming: The Orange Is The New Black actress flashed a radiant smile - and her sparkling new engagement ring

Bling: She showed off the significant piece of jewelry - a gold band with large solitaire diamond - as she placed her hand on her hip

Bling: She showed off the significant piece of jewelry - a gold band with large solitaire diamond - as she placed her hand on her hip

Us Weekly reported in July that the twosome were spotted making out at French bistro Lucien.

Fellow actor Ben was last engaged to House Of Cards star Robin Wright, the ex of Sean Penn.

The former couple, who had dated for more than three years, quietly ended their engagement for a second time last year.

Ben and Robin first broke up in November 2014 but got back together shortly after.

Stunning: Laura was elegantly dressed in a simple black dress with a polka dot lace overlay

Stunning: Laura was elegantly dressed in a simple black dress with a polka dot lace overlay

Vintage vibe: The 50s style garment was cinched in at the waist with a patent leather belt, and set off with a pair of pointed suede pumps

Vintage vibe: The 50s style garment was cinched in at the waist with a patent leather belt, and set off with a pair of pointed suede pumps

Meanwhile, Laura hasn't been reported to have been in a serious relationship since her 2007 split from actor Christopher Masterson, the brother of her That 70's Show co-star Danny Masterson.

The Mastersons, like Prepon, are Scientologists. Last year in an interview Prepon called Scientology practices 'like magic' and credited the church with helping her acting.

Interestingly, Ben and Laura are both pals of Danny's and it's rumoured that the mutual friendship is how the couple met.

In 2014 Laura lamented her lack of luck in the romance department.

'When I'm working, it's next to impossible,' she told Cosmopolitan in 2014 as she confirmed her single status.

'I like to think I'll just be walking down the street one day and stop and meet someone, like, "Oh, my God, you're awesome," and then we start dating. But, no.'

'Guys occupy a lot of attention space in your mind,' she added. 'When I'm working, living in a new place, it's kind of cool I don't have to deal with that.'

Whirlwind engagement: Rumours that the couple were dating first emerged earlier this summer when they were pictured out in New York together

Whirlwind engagement: Rumours that the couple were dating first emerged earlier this summer when they were pictured out in New York together

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